fe0e62e011
- Implement HTTP Basic auth for OAuth token requests - Automatically sets selects auth method when OAuthClientProvider is configured with OAuthClientMetadata that has token_endpoint_auth_method=None. - Made OAuthClientMetadata.token_endpoint_auth_method optional to support the above auto-configuration. - Removed ` "token_endpoint_auth_method": "client_secret_post"` from the simple-auth-client example as is now auto-configured.