feat(consensus): Support one node committee

[piotrm50]

Description of change

Porting upstream change: MystenLabs/sui@6e6c72d

Obviously there is no fault tolerance. But this should be useful for running local cluster cheaply. min_round_delay should be set to a higher value for local cluster so not too many consensus blocks are built.

Merging to protocol-version-6 because this PR depends on RoundProber changes.

Type of change

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• Enhancement (a non-breaking change which adds functionality)

How the change has been tested

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Change checklist

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• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

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