CLOUDP-331496: Split operator roles into smaller templates: split base role

[m1kola]

Summary

In #258 I split existing roles into separate files: base RBAC, telemetry, webhook and clustermongodbroles related RBAC.

In this iteration we split basic role further. We separate PVC resize permissions into a separate role.

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[lsierant]

LGTM!
While it's functionally equivalent it is a somewhat user facing change. Consider putting a RN entry just for awareness.

[MaciejKaras]

Looks good!

Still this PR is not only about moving the yamls around but it also introduces new template. Some of the template expressions are tested with helm (public dir), but I miss the testing facility for our helm charts to support different input values.

[m1kola]

@MaciejKaras sorry if my description gave the wrong impression. #258 was moving things into new templates. This PR is slightly move invasive since it introduces a new role & role binding.

Regarding testing: Nam shared https://github.com/helm-unittest/helm-unittest with me recently, but I haven't tried it. We might want to look into whether it is worth adopting it.

@lsierant I'm not sure if this change is worthy of a release note, but we can add it just in case. I think I'll do it in a separate PR so I don't have to wait for the CI again here.

[m1kola]

Merging. Release notes will be added in #266.