Compile python modules

[vidyalakshmir]

Context:

To support the Python test suite, we need to provide pre-compiled .cwasm binaries for specific internal modules.

Changes:

This script introduces the pipeline to convert the following static archives (.a) into optimized WebAssembly binaries (.cwasm):

Modules/_hacl/libHacl_Hash_SHA1.a
Modules/_hacl/libHacl_Hash_BLAKE2.a
Modules/_hacl/libHacl_Hash_SHA3.a
Modules/_hacl/libHacl_HMAC.a
Modules/_hacl/libHacl_Hash_MD5.a
Modules/_decimal/libmpdec/libmpdec.a
Modules/expat/libexpat.a```

##  Details:
The conversion strictly follows the .a ➔ .wasm ➔ .opt.wasm ➔ .opt.cwasm path.

## Next Steps:
If this standalone approach is correct and approved, we can have this included with `compile_python.sh` or called from that script.