DPS: implement API Key Authorization profile

[ndr-brt]

Feature Request

As specified in https://github.com/eclipse-dataplane-signaling/dataplane-signaling/blob/main/docs/signaling.md#api-key

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.

[ndr-brt]

Closing as the API Key authorization profile will be removed from the spec (ref)