Watcher: Control Loop for Kyma CR

[jeremyharisch]

Implement two seperate control loops for the KCP-Watcher-Operator

We will have one ConfigMap per Watcher CR (and one Watcher CR per operator) on the KCP. This ConfigMap includes all Kymas which make use of this operator. It will later on be used for reconciling the Watcher on all Kymas.

ACs:

• If generation on Kyma CR changes, then the control loop updates all corresponding ConfigMaps of the Watcher CRs which are mentioned in the Kyma CR
• (Should throw error if corresponding ConfigMap is not found)