Introduce a new feature to monitor the progression of an ongoing partition rebalance executed by a Strimzi-managed Cruise Control instance via a `KafkaRebalance` custom resource.

Tracking upstream issue here: https://github.com/strimzi/strimzi-kafka-operator/issues/10278

Current notes and plan can be found here: https://docs.google.com/document/d/1QcR_8LHc6T9lJi9krC_fCFOoWFxqkXuAo4uCweumBG4/edit?tab=t.0