(WIP for after MVR) Add ratelimiting and caching to the GitHub release collector

[KevinMGranger]

This is still a WIP, and master has drifted from it. Still, I think it's important, and want it here as a reminder and for visibility once we can resume work on it.

It can serve as a model for how we'd introduce similar things to other collectors.

[openshift-ci]

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[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-merge-robot]

@KevinMGranger: PR needs rebase.

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[KevinMGranger]

/hold Let's revisit this after #720 is merged.

[openshift-ci]

@KevinMGranger: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/4.12-e2e-openshift	2eec54d	link	true	/test 4.12-e2e-openshift
ci/prow/4.13-e2e-openshift	2eec54d	link	true	/test 4.13-e2e-openshift

Full PR test history. Your PR dashboard.

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