feat: refactor quotas

[oliverbaehler]

Describe the feature

Currently via the Tenant specification we can create quotas, which are scoped to the entire tenant or for each namespace identical. I would like to remove the spec or deprecate it in favour of different approaches.

• Add a new CRD called GlobalQuota, the Quota has a namespace selector as property, allowing to select all namespaces within a tenant or select from multiple tenants. The CRD would track the usage in their status, which is currently doe via annotations. Seems like a much cleaner approach. Additionally it should have a webhook, checking all resources which can allocate ifra resources (Pods and PVs) if the requested resources go over that status threshold.

• Namespace-scope can be covered via Replications, therefor nothing new to implement

I would completely remove the quota spec with the v1 release, WDYT @prometherion @MaxFedotov

[prometherion]

I'm ok with that, what I'm worried about is that we should replicate all the ResourceQuota behaviours and scopes, which is not easy.