[Security] OAuth2 Introspection Endpoint (RFC7662)

In addition to the excellent work of @vincentchalamon #48272, this PR allows getting the data from the OAuth2 Introspection Endpoint. This endpoint is defined in the [RFC7662](https://datatracker.ietf.org/doc/html/rfc7662). It returns the following information that is used to retrieve the user:

* If the access token is active
* A set of claims that are similar to the OIDC one, including the `sub` or the `username`.

Author: Spomky

DependencyInjection/Compiler/UnusedTagsPass.php

@@ -85,6 +85,7 @@ class UnusedTagsPass implements CompilerPassInterface
         'routing.route_loader',
         'scheduler.schedule_provider',
         'scheduler.task',
+        'security.access_token_handler.oidc.encryption_algorithm',
         'security.access_token_handler.oidc.signature_algorithm',
         'security.authenticator.login_linker',
         'security.expression_language_provider',