Moved methods `transformUserInfoToken`, `transformAccessToken`,
`transformIDToken` to the `AbstractOIDCProtocolMapper` base class
in order to reduce code duplication.
Previously every mapper implemented at least one or two of those
methods with exactly the same code.
Having those methods in the base class ensures that the code is the
same for all mappers. Since the mentioned methods are declared
on the `OIDCIDTokenMapper`, `OIDCAccessTokenMapper` and `UserInfoTokenMapper`
interfaces `AbstractOIDCProtocolMapper` implementations can now choose
how they should be handled by the `TokenManager`
by implementing the desired set of interfaces `*TokenMapper`-interfaces.
I think this provides a good balance between ease of use, reduced code duplication
and ensured backwards compatiblity.
Existing protocol mapper implementations will still work since they just implement
their own logic for `transformUserInfoToken`, `transformAccessToken`,
`transformIDToken`.
The "claim" information provided by a `ProtocolMapper` to a `*Token` can now
be provided by overriding the `AbstractOIDCProtocolMapper.setClaim` method.
Adapted all eligible ProtocolMapper implementations within the
`org.keycloak.protocol.oidc.mappers` package accordingly.
c3b577de11