feat(conf_loader): new directives to conf WasmX

[locao]

Summary

New directives needed to configure WasmX behavior.

Note: for now a single shm_kv and a single shm_queue can be defined. This is the existent behavior for OpenResty shared dicts, but it would be nice to change.

Checklist

• [x] The Pull Request has tests
• [ ] There's an entry in the CHANGELOG
• [ ] There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Issue reference

KAG-1071