Set up health checking provided the service name

[avinal]

Feature request

The current health checking only checks for Results service.

results/cmd/api/main.go

Lines 150 to 153 in 2b03ffa

	// Set up health checks.
	hs := health.NewServer()
	hs.SetServingStatus("tekton.results.v1alpha2.Results", healthpb.HealthCheckResponse_SERVING)
	healthpb.RegisterHealthServer(s, hs)

Update the health service for the following. Refer: https://github.com/grpc/grpc/blob/master/doc/health-checking.md

• Implement the Health Service
• Add REST endpoint for the health service
• Add Logs service to health checking

[avinal]

I can take on this issue.

[khrm]

/assign @avinal

[avinal]

/assign @sayan-biswas