builtins: product, sort, sum

[DFrenkel]

Also: implementing internal.member_3 for compliance testing

Resolves #12

[DFrenkel]

Compliance tests contain two failures and the rest are passing:

• numbers.range failure will resolve itself once builtins: numbers.range and range_step #10 is merged
• count with invalid utf-8 chars test will be addressed separately

Build complete! (0.19s)
	✅ aggregates/test-aggregates-0003.json: aggregates/count keys -> eval
	✅ aggregates/test-aggregates-0001.json: aggregates/count -> eval
	✅ aggregates/test-aggregates-0004.json: aggregates/count keys virtual -> eval
	✅ aggregates/test-aggregates-0005.json: aggregates/count set -> eval
	✅ aggregates/test-aggregates-0016.json: aggregates/max virtual set -> eval
	✅ aggregates/test-aggregates-0009.json: aggregates/sum virtual set -> eval
	✅ aggregates/test-aggregates-0015.json: aggregates/max virtual -> eval
	✅ aggregates/test-aggregates-0002.json: aggregates/count virtual -> eval
	✅ aggregates/test-aggregates-0008.json: aggregates/sum virtual -> eval
	✅ aggregates/test-aggregates-0006.json: aggregates/sum -> eval
	✅ aggregates/test-aggregates-0014.json: aggregates/max set -> eval
	✅ aggregates/test-aggregates-0013.json: aggregates/max -> eval
	✅ aggregates/test-aggregates-0012.json: aggregates/product set -> eval
	✅ aggregates/test-aggregates-0011.json: aggregates/product -> eval
	✅ aggregates/test-aggregates-0010.json: aggregates/bug 2469 - precision -> eval
	✅ aggregates/test-aggregates-0007.json: aggregates/sum set -> eval
	✅ aggregates/test-aggregates-0017.json: aggregates/min -> eval
	✅ aggregates/test-aggregates-0020.json: aggregates/min set -> eval
	✅ aggregates/test-aggregates-0018.json: aggregates/min dups -> eval
	✅ aggregates/test-aggregates-0019.json: aggregates/min out-of-order -> eval
	✅ aggregates/test-aggregates-0023.json: aggregates/reduce ref dest -> eval
	✅ aggregates/test-aggregates-0021.json: aggregates/min virtual -> eval
	✅ aggregates/test-aggregates-0025.json: aggregates/sort -> eval
	✅ aggregates/test-aggregates-0024.json: aggregates/reduce ref dest (2) -> eval
	✅ aggregates/test-aggregates-0022.json: aggregates/min virtual set -> eval
	✅ aggregates/test-aggregates-0027.json: aggregates/count string -> eval
	✅ aggregates/test-aggregates-0026.json: aggregates/sort set -> eval
	✅ aggregates/test-aggregates-0028.json: aggregates/count error null -> eval
	✅ aggregates/test-aggregates-0027.json: aggregates/count string -> eval
↳ 	❌ aggregates/test-aggregates-bad-utf8-runes.json: aggregates/count with invalid utf-8 chars (0xFFFD) -> eval: testAssertionFailed(expected: AST.RegoValue.array([AST.RegoValue.object([AST.RegoValue.string("x"): AST.RegoValue.array([AST.RegoValue.number(30)])])]), actual: AST.RegoValue.array([AST.RegoValue.object([AST.RegoValue.string("x"): AST.RegoValue.array([])])]))
	✅ aggregates/test-membership.json: aggregates/member simple, set -> eval
	✅ aggregates/test-aggregates-0028.json: aggregates/count error number -> eval
	✅ aggregates/test-membership.json: aggregates/member simple, array -> eval
	✅ aggregates/test-membership.json: aggregates/member simple, object -> eval
	✅ aggregates/test-membership.json: aggregates/member array with index -> eval
	✅ aggregates/test-membership.json: aggregates/member array with index, nested -> eval
	✅ aggregates/test-membership.json: aggregates/member object with key, nested, associativity without parens -> eval
	✅ aggregates/test-membership.json: aggregates/member array with index, nested, associativity without parens -> eval
	✅ aggregates/test-membership.json: aggregates/member object with key -> eval
	✅ aggregates/test-membership.json: aggregates/member object with key, nested -> eval
	✅ aggregates/test-membership.json: aggregates/member simple false, array -> eval
	✅ aggregates/test-membership.json: aggregates/member simple false, set -> eval
	✅ aggregates/test-membership.json: aggregates/member operator precedence with other infix operator (+) -> eval
	✅ aggregates/test-membership.json: aggregates/member with not -> eval
	✅ aggregates/test-membership.json: aggregates/member simple false, object -> eval
	✅ aggregates/test-membership.json: aggregates/member chained -> eval
	✅ aggregates/test-membership.json: aggregates/member with vars -> eval
	✅ aggregates/test-membership.json: aggregates/member operator precedence in list (set) -> eval
	✅ aggregates/test-membership.json: aggregates/member operator precedence in list with parens (set) -> eval
	✅ aggregates/test-membership.json: aggregates/member operator precedence in list with parens (array) -> eval
	✅ aggregates/test-membership.json: aggregates/member operator precedence in list (array) -> eval
	✅ aggregates/test-membership.json: aggregates/member operator precedence in list (fun args) -> eval
	✅ aggregates/test-membership.json: aggregates/member non-collection string -> eval
	✅ aggregates/test-membership.json: aggregates/member operator precedence in list with parens (fun args) -> eval
	✅ aggregates/test-membership.json: aggregates/member composite containee -> eval
	✅ aggregates/test-membership.json: aggregates/member non-collection number -> eval
	✅ aggregates/test-membership.json: aggregates/member+some ground value -> eval
	✅ aggregates/test-membership.json: aggregates/member with key in non-collection (number) -> eval
	✅ aggregates/test-membership.json: aggregates/member+some simple, array -> eval
↳ 	❌ aggregates/test-membership.json: aggregates/member+some containee is call -> eval: testFailed(reason: "unexpected evaluation error: builtinNotFound(name: \"numbers.range\")", error: Optional(Rego.BuiltinRegistry.RegistryError.builtinNotFound(name: "numbers.range")))
	✅ aggregates/test-membership.json: aggregates/member+some ground composite containee -> eval
	✅ aggregates/test-membership.json: aggregates/member+some non-ground composite containee -> eval
	✅ aggregates/test-membership.json: aggregates/member+some ground composite containee (false) -> eval
	✅ aggregates/test-membership.json: aggregates/member+some+key non-ground value -> eval
	✅ aggregates/test-membership.json: aggregates/member+some+key non-ground key -> eval
	✅ aggregates/test-membership.json: aggregates/member+some non-ground composite containee, multiple bindings -> eval
	✅ aggregates/test-membership.json: aggregates/member+some+key non-ground key+value -> eval
	✅ aggregates/test-membership.json: aggregates/member+some+key non-ground, composite key -> eval
	✅ aggregates/test-membership.json: aggregates/member+some+ref -> eval
	✅ aggregates/test-membership.json: aggregates/member+some+key+ref -> eval
	✅ aggregates/test-membership.json: aggregates/member+some+key+ref with other variable -> eval
	✅ aggregates/test-membership.json: aggregates/member+some+with -> eval
make: *** [test-compliance] Error 1