Use kvm address in producer selection

[Xela101]

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2. Have you checked to ensure there aren't other open Pull Requests for the same update/change?
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4. All new and existing tests passed.
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• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Enhancement
• What is the current behavior? (You can also link to an open issue here)
  Catalyst uses PubKey and its not compatible for Smart Contract validators
• What is the new behavior (if this is a feature change)?
  Use KvmAddress instead of PubKey for Smart Contract validators
• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  No
• Other information:

[stxphxn]

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