Add Support OAuth2AuthorizationRequestResolver As Bean

[franticticktick]

Closes gh-16380

[kse-music]

Is it better to return early when the OAuth2AuthorizationRequestResolver bean exists?

OAuth2AuthorizationRequestResolver bean = getBeanOrNull(resolvableType);
if(bean != null) {
    return bean;
}
String authorizationRequestBaseUri = this.authorizationEndpointConfig.authorizationRequestBaseUri;
if (authorizationRequestBaseUri == null) {
	authorizationRequestBaseUri = OAuth2AuthorizationRequestRedirectFilter.DEFAULT_AUTHORIZATION_REQUEST_BASE_URI;
}
return new DefaultOAuth2AuthorizationRequestResolver(clientRegistrationRepository,
		authorizationRequestBaseUri);

[franticticktick]

Hey @kse-music , thanks for suggestion, this will be a good polish.

[rwinch]

Thanks for the Pull Request! This is now merged into main 😄