The AuthorizationCodeAuthenticationProvider implements part of the
Authorization Code Grant flow as defined in
OAuth 2.0 Authorization Framework and OpenID Connect Core 1.0.
The implementation needs to be de-coupled to allow for better re-use and readability.
This commit introduces the AuthorizationGrantAuthenticator and extracts logic from
AuthorizationCodeAuthenticationProvider and provides different implementations
for OAuth 2.0 and OpenID Connect 1.0.
This re-factor is part of the work required for Issue gh-4513
f8a9077d5a