Memory consumption is high

[boris-smidt-klarrio]

Describe the bug
The memory consumption is quite high of this operator

To Reproduce
Deploy the controller on a larger cluster

Expected behavior
It should only keep the secrets in memory with the labels of the replication.

Environment:

• kubernetes-replicator version: [e.g. v2.9.2]

Additional context

There was already an issue #284 fix but no changes the changes where never released.
It might be usefull to also filter certain namespaces from where the secret/data might originate to limit the memory usage.

My suggestion, it would be besst to release 'v2.10.0' with the flags.