feat(consensus): Gargabe Collection - 2

[piotrm50]

Description of change

Porting upstream change: MystenLabs/sui@6d9b1f9

This is the second part of Garbage Collection which implements the
following ticked next steps as outlined on the previous PR

• BlockManager to respect the gc_round when accepting blocks and
  trigger clean ups for new gc rounds
• Skip blocks that are received which are <= gc_round
• Not propose ancestors that are <= gc_round
• Subscriber to ask for blocks from gc_round when
  last_fetched_round < gc_round for a peer to prevent us from fetching
  unnecessary blocks

Next steps:

• Re-propose GC'ed transactions (probably not all of them)
• Implement new timestamp approach so ancestor verification is not
  needed
• Harden testing for GC & edge cases

Links to any relevant issues

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Type of change

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• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How the change has been tested

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Make sure to provide instructions for the maintainer as well as any relevant configurations.

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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