Expose GC API to Binaryen.JS

[GulgDev]

Adds TypeBuilder interface and the following WasmGC instructions to JS: ref.test, ref.cast, any.convert_extern, extern.convert_any, br_on_null, br_on_non_null, br_on_cast, br_on_cast_fail, struct.new, struct.new_default, struct.get, struct.set, array.new, array.new_default, array.new_fixed, array.new_data, array.new_elem*, array.get, array.set, array.len, array.fill*, array.copy, array.init_data*, array.init_elem*.
Instructions that were added both to JS and to C are marked with an asterisk (*).
The corresponding test case was also added (gc.js).
Fixes #5921
This PR also fixes memory leaks caused by stack allocations that are not wrapped in preserveStack.

[GulgDev]

There are some functions I'm unsure how to implement. For example, I can't seem to find a C implementation of array.init_elem

[kripken]

Yes, it looks like ArrayInitElem needs to be added to the C API, first.

[kripken]

Looks like there are errors on CI, might make sense to fix those before I do an in-depth review here, but let me know if you are stuck.

[GulgDev]

Looks like there are errors on CI, might make sense to fix those before I do an in-depth review here, but let me know if you are stuck.

I'm not stuck, just doing some experiments. I will re-request review when I'm done, thanks! The missing C API is already there, just need to add JS wrapper & tests.

I had some issues with testing locally, so I had to use CI for that purpose, but I finally managed to resolve this problem. I think that tests are just not optimized for Windows.

[kripken]

Great work, thanks @GulgDev !