Expose Resolvers Controller performance tuning configurations

[khrm]

This changes the resolvers controllers to start with a config. We expose ThreadsPerController, QPS and Burst for performance tuning as we do for pipelines controller.

Changes

Submitter Checklist

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• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
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Release Notes

We can specify custom performance tuning values in the watcher's deployment - controller container via threads-per-controller, kube-api-qps and kube-api-burst flags.

[khrm]

/kind feature

[khrm]

/assign @vdemeester

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
cmd/resolvers/main.go	55.6%	29.4%	-26.1

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
cmd/resolvers/main.go	55.6%	29.4%	-26.1

[vdemeester]

/approve
/cc @afrittoli

we probably want to cherry pick this one 🙏🏼

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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