Add IETF RFC 7009 Token Revocation

[pboling]

• Added IETF RFC 7009 Token Revocation
  • OAuth2::Client#revoke_token
  • OAuth2::AccessToken#revoke
• OAuth2::AccessToken#refresh now supports block param pass through
• OAuth2.config is no longer writable
  • the hash it contains still is, of course!
• Errors raised by OAuth2::AccessToken are now always OAuth2::Error and have better metadata
• Fixes Example: How to I deauthorize a token? #224, https://gitlab.com/oauth-xx/oauth2/-/issues/224

Please help me support open source by sponsoring me - @pboling

[coveralls]

Pull Request Test Coverage Report for Build 15057475457

Details

• 70 of 70 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 15050923767:	0.0%
Covered Lines:	517
Relevant Lines:	517

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💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (fd098bb) to head (20a5f2b).
Report is 10 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #643   +/-   ##
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