Add support for Server-Side Apply finalizer management (#3275)

This improves performance and load on the k8s API by decreasing the
number of re-tries, especially on objects managed by multiple
controllers. The feature is opt-in and the current use of merge patch is
still the default behavior.
We introduce three controller options:
- UseServerSideApplyForFinalizers used to enable that functionality.
- FinalizerFieldManager to specify finalizer field manager, required
  when SSA is enabled.
- ForceApplyFinalizers to set the force option on the apply patch
  (default disabled).

Author: enarha