Migrate from openapi-parser to openapi-resolver

[j3rem1e]

openapi-parser is closed sources and doesn't supports some features of openapi 3.1 like description/summary overrides.

I didn't fix the webcomponent "json-schema-viewer" which doesn't seem to be documented, and doesn't work in master (at least when I tried it).

[j3rem1e]

@mrin9 Can you have a look at this ? Thanks !