Implement client authentication support for the PAR endpoint #2341
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In the current implementation, client authentication is only enforced at the token endpoint level in a PAR-enabled flow. This PR updates the PAR endpoint offered by the server to also support client authentication, which allows rejecting unauthenticated requests early, without waiting for the token request to be sent/processed.
The rules and the supported methods are the same as the token endpoint.
Note: this PR will likely be backported to the 6.x branch.