Issue 3178 custom token revocation

[loftum]

Summary

• Added ITokenRevocationService / DefaultTokenRevocationService
• Added IdentityServerServiceFactory.TokenRevocationService
• Moved revocation logic from RevocationEndpointController to DefaultTokenRevocationService
  Configurable token revocation policy #3178

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[dnfclas]

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[pontusr]

Hey, thanks for the work on this @loftum, @leastprivilege and @brockallen. Any way to get this in 2.6.1? We've been holding off extending with our own endpoint since we would prefer this functionality on the core revocation endpoint.