[mlir][core] Move InitAll*** implementation into static library. (#150805)

`InitAll***` functions are used by `opt`-style tools to init all MLIR
dialects/passes/extensions. Currently they are implemeted as inline
functions and include essentially the entire MLIR header tree. Each file
which includes this header (~10 currently) takes 10+ sec and multiple GB
of ram to compile (tested with clang-19), which limits amount of
parallel compiler jobs which can be run. Also, flang just includes this
file into one of its headers.

Move the actual registration code to the static library, so it's
compiled only once.

Discourse thread
https://discourse.llvm.org/t/rfc-moving-initall-implementation-into-static-library/87559

Author: Hardcode84

mlir/lib/CAPI/RegisterEverything/CMakeLists.txt

@@ -1,19 +1,16 @@
 # Dialect registration.
-get_property(dialect_libs GLOBAL PROPERTY MLIR_DIALECT_LIBS)
 get_property(translation_libs GLOBAL PROPERTY MLIR_TRANSLATION_LIBS)
-get_property(conversion_libs GLOBAL PROPERTY MLIR_CONVERSION_LIBS)
-get_property(extension_libs GLOBAL PROPERTY MLIR_EXTENSION_LIBS)
 add_mlir_upstream_c_api_library(MLIRCAPIRegisterEverything
   RegisterEverything.cpp
 
   LINK_LIBS PUBLIC
-  ${dialect_libs}
   ${translation_libs}
-  ${conversion_libs}
-  ${extension_libs}
 
   MLIRBuiltinToLLVMIRTranslation
   MLIRCAPIIR
-  MLIRLLVMToLLVMIRTranslation
   MLIRCAPITransforms
+  MLIRLLVMToLLVMIRTranslation
+  MLIRRegisterAllDialects
+  MLIRRegisterAllExtensions
+  MLIRRegisterAllPasses
 )