Let other services use config cache

[Michal-Leszczynski]

This is the first general step toward fixing #3892.
It allows for accessing config cache service from other services.
Actually using config cache service will be implemented in separate PRs.

Ref #3892

[VAveryanov8]

LGTM 👍

[Michal-Leszczynski]

@karol-kokoszka @VAveryanov8 sorry guys, I added one more commit to the PR.
When trying to use the changes on other branch, it turned out that I also need to add a cluster to the cluster svc passed to config cache svc. Otherwise, config cache svc would never query this cluster config.

[karol-kokoszka]

@Michal-Leszczynski I understand this PR just injects the service to other services that are going to use it, right ?
The approach could be to do it in the PR that actually starts consuming this config-cache in other services.

[karol-kokoszka]

But feel free to merge.

[Michal-Leszczynski]

The approach could be to do it in the PR that actually starts consuming this config-cache in other services.

Yea, but I already implemented a helper method for creating config cache svc in tests in this PR and it wasn't wasn't really working correctly (because of describes problem), so I wanted to keep it as a part of this PR.