Feat: Various changes and updates

[tarsil]

Checklist

• The code has 100% test coverage.
• The documentation was properly created or updated (if applicable) following the correct guidelines and appropriate language.
• I branched out from the latest main or is a sub-branch.

Summary or description

There are a lot to unpack.

1. OpenAPI security for OAuth2 updated from the scratch.
2. New Security parameter.
3. Docs