Implement a simple in-mem cache (with opt-in).

[vaikas]

A caching interface was implemented and by default it's implemented by just a placeholder. We should implement a simple in-memory cache to reduce hits on registry.

Interface:
https://github.com/sigstore/policy-controller/blob/main/pkg/webhook/cache.go#L47

And then it should be injected into the context somewhere around here based on flags:
https://github.com/sigstore/policy-controller/blob/main/cmd/webhook/main.go#L76

[hectorj2f]

@vaikas Should we include this issue into the v1 milestone ?

[vaikas]

I think we should do it even before :) But sure!

…

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