Implement Chicory WASM backend for the Ruby API

[headius]

This PR will provide a new Ruby API backend (in addition to the C extension and the FFI wrapper) based on the Chicory WASM runtime for the JVM.

This version of the gem will be published for JRuby users as the default cross-platform gem. Future gems will make platform-specific binary builds available for users that desire the additional performance.

The goal here is to get a native-code free version of the prism gem released for JRuby users.

[headius]

This depends upon changes in #3944 and will be rebased once that merges to main.

[eregon]

I wonder if it'd make sense to support the WASM case in lib/prism/ffi.rb directly and e.g. define LibRubyParser as WASM::PRISM or so in that case, or to share some of the logic.
This looks like an early prototype as much of the logic is copied and probably not working yet (since it refers LibRubyParser and that's not set in the new file).

[headius]

This looks like an early prototype

Yes, that's why it's a draft.