[extension/healthcheckv2] Add partial gRPC service implementation #34028
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Description:
The PR is the fourth in a series to decompose #30673 into more manageable pieces for review. This PR introduces the basic structure for the gRPC health check service, which is an implementation of the grpc_health_v1 service. This PR implements the unary
Check
RPC. In order minimize PR size, the streamingWatch
RPC will be introduced in a followup.Link to tracking Issue: #26661
Testing: Units / manual
Documentation: Comments, etc.