Allow opting into standard GC encodings at compile time (#5868)

Depending on whether preprocessor macros USE_STANDARD_GC_ENCODINGS and
USE_LEGACY_GC_ENCODINGS are defined, use the standard or legacy encodings for GC
types and instructions. Default to the latter for now. When WasmGC reaches phase
4, we will switch the default to be the standard encodings instead. After users
have time to update, we will remove the legacy encodings entirely.

Tested manually by building with USE_STANDARD_GC_ENCODINGS locally and seeing
that all the tests pass except for some tests that depend on the specific binary
encoding.

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