NIFI-7584-rebase-squash Added a POST request to the OIDC revoke endpo…

[mtien-apache]

…int for logout.

Added method to validate the OIDC Access Token for the revoke endpoint.
Created a new callback URI of oidc/logoutCallback to handle certain OIDC logout cases.
Changed method to exchange the Authorization Code for a Login Authentication Token.
Added a new method to exchange the AuthN Code for an Access Token.
Changed method to convert OIDC Token to a Login AuthN Token instead of a NiFi JWT.

NIFI-7584-rebase-squash Changed the validateAccessToken method to take an AccessTokenHash object as a parameter.

NIFI-7584-rebase-squash Changed static messages to be constant variables in AccessResource.

NIFI-7584-rebase-squash Added a check to determine which OIDC logout method to use
based on the configured OIDC discovery url in nifi.properties.

NIFI-7584-rebase-squash Separated the logout endpoints for different ID Providers.
Added a new method to exchange an AuthN Code for an ID Token.
Separated the authorization and authentication for OIDC client requests.

NIFI-7584-rebase-squash Cleaned up the code.

NIFI-7584-rebase-squash Added tests to StandardOidcProviderGroovyTest.
Extracted the Access Token validation method.

NIFI-7584-rebase-squash Created new OidcServiceGroovyTest class.

NIFI-7584-rebase-squash Fixed and added tests.

NIFI-7584-rebase-squash Added tests.

NIFI-7584-rebase-squash Cleaned up code and removed comments.

NIFI-7584-rebase-squash Fixed issue of a HTTP request not closing the connection.

NIFI-7584-rebase-squash Added Exceptions to methods.

NIFI-7584-rebase-squash [WIP] Added tests in OidcServiceTest.

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Enables X functionality; fixes bug NIFI-YYYY.

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[mtien-apache]

Still need to add one more unit test, but the rest of the changes may be reviewed in the mean time. Thanks. @alopresto @thenatog @bbende @mcgilman

[mtien-apache]

Opened a new PR #4593. Closing this PR.