New features for API Docs module

Implemented the new features.
1. Created field formatter to render redoc & swagger open api specs.
2. Content level data holders related to API Docs are created.
3. Created a view to show the API docs and API doc pages.

Updated the Readme, with the features covered - https://git.drupalcode.org/project/api_docs/-/blob/2.0.x/README.md

Will be released in the upcoming release.

Released this features in the 2.0.0 → version.

Updated the module page → with the details of usage.

Automatically closed - issue fixed for 2 weeks with no activity.