Support Cached key set

[swiffer]

This is meant to gather your thoughts on support for cachedKeySets.

Instead of providing an array with keys to jwks and URL could be passed which is then fetched and cached by php-jwt. Configuration options still TBD.

This functionality has been added to php-jwt in 6.2: https://github.com/firebase/php-jwt/pull/397

The revelant change would be among these lines: https://github.com/cakephp/authentication/pull/535/files#diff-ace0e7f81ad6600f2a672e7393458f22cc0f8c44e69bd76ef9be077e677c14fbR158

[othercorey]

This needs to be rebased.

[swiffer]

This needs to be rebased.

Yes, Happy to do that once #507 is merged / decided and 2.x-next Up to date or 3.x ist existing

[othercorey]

Merged 2.x into 2.next.

[swiffer]

done - it's still containing the commit of #507

[github-actions[bot]]

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