Identity Service: introduce VerificationContext

[wolf4ood]

Feature Request

As part of the #3662 we want the IdentityService to receive extra/additional contextual information about the current verification call.

Which Areas Would Be Affected?

core

Why Is the Feature Desired?

IdentityService implementors could provide additional checks/logic based on the verification context

Solution Proposal

The IdentityService#verifyJwtToken will be changed:

from:

Result<ClaimToken> verifyJwtToken(TokenRepresentation tokenRepresentation, String audience);

to:

Result<ClaimToken> verifyJwtToken(TokenRepresentation tokenRepresentation, VerificationContext context); 

For now the VerificationContext will contain the audience for backward compatibility and a Policy that's associated
with the current verification process.

Policy extraction for the current context will be tacked in separated PRs accordingly to their area (catalog,transfer process, contract negotiation)