SCORU: Wasm: Add lib_scoru_wasm and call from Proto Env

Add skeleton lib_scoru_wasm and call it from Protocol Environment.

Fixes #3090 (closed) #3095

(along with !5529 (merged))

TODO

• Add tests showing that it can produce proofs
• Add tests showing that it can verify proofs
• Reduce lib_scoru_wasm to skeleton
• Clean up
• Document what methods may fail at runtime (esp in Proto/verif path)
• Check Tree2 ticket resolved

Depends on !5481 (merged) !5416 (merged)

Context

Manually testing the MR

make -C manifest && make all build-unreleased
dune exec src/proto_alpha/lib_protocol/test/integration/operations/main.exe -- test "^sc rollup$"
dune test src/lib_webassembly
dune exec src/proto_alpha/lib_protocol/test/integration/main.exe -- test "^sc rollup wasm$"
make test-webassembly

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR