Enable WASM AOT option in build and update MonoAOTCompiler (#44468)

Enable WASM AOT option in build and update MonoAOTCompiler (#44468)

Allows creating AOT images for WASM with the AOT compiler and consuming them in the runtime.

Use `make build AOT=1` in `src/mono/netcore/sample/wasm/console` to try it out.

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Also fix a regression in aot-compiler.c regarding SPC->corlib assembly name:

In https://github.com/dotnet/runtime/commit/035ebeab160b9a281e5fbb3fa0c237f244c81b7a we added a simplified prefix for symbol names in System.Private.CoreLib.
However this shouldn't happen for the actual assembly name otherwise we aren't able to find the AOT module linked statically into the binary.