WIP: enable pprof via knative in api svr; dump goroutines after long running RPC; optimize k8s client

[gabemontero]

Changes

/kind misc

Need to be able to profile api server with pprof like we can the watcher (though I'm trying to do it with defaults and not set up the config map watching initially)

Also some production level k8s client tuning that should be fine in developer mode.

Dumping of goroutines on abnormally long GRPC calls.

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Release Notes

pprof now enabled via tekton/knative config map approach

[tekton-robot]

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[gabemontero]

@sayan-biswas @khrm @avinal @enarha we'll probably merge some form of this downstream first before merging this PR here but I wanted to see if anything unexpected happened running the build/integration tests here.

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
cmd/api/main.go	11.9%	10.5%	-1.4

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
cmd/api/main.go	11.9%	10.2%	-1.7

[gabemontero]

@sayan-biswas enabled pprof with https://github.com/tektoncd/results/pull/743