DPS: implement OAuth 2 Client Credentials Grant authorization profile

[ndr-brt]

Feature Request

As specified in https://github.com/eclipse-dataplane-signaling/dataplane-signaling/blob/1b6195502714ea582c2362c630db403e080a5e87/docs/signaling.md#oauth-2-client-credentials-grant

Which Areas Would Be Affected?

e.g., DPF, CI, build, transfer, etc.

Why Is the Feature Desired?

Are there any requirements?

Who will sponsor this feature?

Please @-mention the committer that will sponsor your feature.

Solution Proposal

If possible, provide a (brief!) solution proposal.