Support CREATE SEQUENCE options in any order

[stevenliebregt]

This changes the parsing of the CREATE SEQUENCE options to allow the individual options to appear in any order.

The reason I'm opening this pull request is that the Postgres pg_dump utility dumps CREATE SEQUENCE statements like this:

CREATE SEQUENCE name6
AS INTEGER
START WITH 1
INCREMENT BY 1
NO MINVALUE
NO MAXVALUE
CACHE 1

Where the START WITH 1 appears before the INCREMENT BY 1, Postgres allows this but the parser did not.

There should not be any noticable performance impact I think. I did run the benchmarks and did not see any impact.

[iffyio]

Suggested change

	let sql9 = "CREATE SEQUENCE name6
	AS INTEGER
	START WITH 1
	INCREMENT BY 1
	NO MINVALUE
	NO MAXVALUE
	CACHE 1";
	pg().one_statement_parses_to(sql9, "CREATE SEQUENCE name6 AS INTEGER START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1");
	pg().verified_stmt("CREATE SEQUENCE name6 AS INTEGER START WITH 1 INCREMENT BY 1 NO MINVALUE NO MAXVALUE CACHE 1");

it looks like this should be equivalent?

[iffyio]

Suggested change

	let mut should_continue_loop = true;
	while should_continue_loop {
	loop {

It looks like we can skip the bool var and instead use a combination of continue and break to manage the loop?

[iffyio]

Can we add a test case with duplicate options?

[stevenliebregt]

@iffyio thanks for the review, I'll be unable to address the comments for the next 2 weeks, but after that I'll address them