Proposal: Move openapi-schema-parser to parser-js

As part of the 2026 community goals (more details here: https://github.com/asyncapi/community/issues/3495), after conducting an audit of all repositories, @derberg suggested (reference: https://asyncapi.slack.com/archives/C34F2JV0U/p1774973085382029?thread_ts=1774874525.585229&cid=C34F2JV0U) moving `protobuf-schema-parser`, `avro-schema-parser`, and `openapi-schema-parser` to `parser-js`.

I am opening this issue to gather the views and approval of the code owners of this repository.

Tagging all code owners for their feedback and approval.
@AayushSaini101 @princerajpoot20