Created by: valmoz
This PR replaces the deprecated Apache Oltu library with ScribeJava for the Java OkHttp client. It also tries to improve the OAuth code as follows:
- uniforming the OAuth authentication to the other auth methods, managing the Authentication as a parameter instead of using an OkHttp interceptor;
- introducing the AuthorizationCode, Password, and ClientCredentials Grants;
- managing authorization URL, refresh URL, and scope parameters for the oauth2 config.
PR checklist
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