c-api: add wasm_config_parallel_compilation_set

[thibaultcha]

This has not been discussed in issues and I do not believe there are tests cases for the config C API. Nevertheless, could we add this flag in the C API with this small changeset?

[alexcrichton]

Looks good to me, thanks!

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[thibaultcha]

Can we restart the CI on this one? I don't think the failures are related; and we'd really like this being part of the next release if possible so that we don't lag too far behind the latest Wasmtime version...

[alexcrichton]

Oh sorry missed the updates here, could you try rebasing? That known flaky test has been fixed on main

[thibaultcha]

Ah, excellent, done!