Add cluster controller type + fix active node id for KRaft

[Haarolean]

• Breaking change? (if so, please describe the impact and migration path for existing application instances)

What changes did you make? (Give an overview)
Fixes #525

• Fixed active controller id for KRaft clusters
• Added a UI indicator for cluster controller type:

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• No need to
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• I have performed a self-review of my own code
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• I have made corresponding changes to the documentation (e.g. ENVIRONMENT VARIABLES)
• My changes generate no new warnings (e.g. Sonar is happy)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

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[Haarolean]

@fallen-up PTAL

[germanosin]

I would save quoruminfo into stats, just in sake of future.

[Haarolean]

Was my initial idea too, but I decided not to, as QuorumInfo.nodes is an empty collection for some reason, voters was non-empty but quite boring from a data perspective, the rest is just not useful in any way in current implementation. What do you think?

[germanosin]

I would still keep it there