FIP 0100: remove batch balancer-related functionality

[BigLep]

Done Criteria

1. Remove batch balancer, associated config and branching logic
2. Aggregate where possible, batch otherwise where possibleAggregation constraints remain:

• For ProveCommitAggregate and ProveCommitSectors3, the minimum sectors for aggregation is 4 and the maximum is 819
• For ProveCommitSectorsNI (Non-Interactive) the minimum sectors for aggregation is 1 and the maximum is 65

Decision matrix should now be:

• PreCommit: prefer batching wherever possible
• Commit:
  • Prefer aggregation on commit where there are at least 4 sectors available for a single commit
  • Otherwise batch where possible

Why Important

See https://github.com/filecoin-project/FIPs/blob/master/FIPS/fip-0100.md#change-motivation

Notes

[rvagg]

More comprehensive description:

1. Remove batch balancer, associated config and branching logic
2. Aggregate where possible, batch otherwise where possibleAggregation constraints remain:

• For ProveCommitAggregate and ProveCommitSectors3, the minimum sectors for aggregation is 4 and the maximum is 819
• For ProveCommitSectorsNI (Non-Interactive) the minimum sectors for aggregation is 1 and the maximum is 65

Decision matrix should now be:

• PreCommit: prefer batching wherever possible
• Commit:
  • Prefer aggregation on commit where there are at least 4 sectors available for a single commit
  • Otherwise batch where possible