Add additional metadata parameters to OpenIdConnectConfiguration

[joegoldman2]

Continuation of #2499. This PR adds the following metadata parameters:

• code_challenge_methods_supported
• device_authorization_endpoint
• revocation_endpoint
• revocation_endpoint_auth_methods_supported
• revocation_endpoint_auth_signing_alg_values_supported

Better to review it without whitespace diff: https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/pull/2637/files?diff=unified&w=1.

Fixes #2456.

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