Refactor agent registrar to separate agent registration services

Timo Furrerrequested to merge
refactoring-agent-registrar-grpc into master
  • Refactor agent registrar to separate agent registration services

This change set refactors of the agent registrar to have separate gRPC services for each agent type.

This is a non-breaking change for agentk, but a breaking change for agentw and runnerc (both don't have any active deployments)

Refs #773

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