[Feature]: Coordinator filters withdrawal requests using consensus rules

[djordon]

Feature - Coordinator filters withdrawal requests using consensus rules

1. Description

The consensus rules for withdrawal requests are detailed in #741. The coordinator must filter the proposed withdrawal requests to be in line with these rules or else the sweep transaction will be rejected when going through validation with peer signers.

1.1 Context & Purpose

The coordinator selects the withdrawal requests to include in a sweep. If it includes a one “bad” request, the signers will reject the sweep transaction, affecting all requests that would be included in the sweep. So the coordinator needs to follow consensus rules when picking requests.

2. Technical Details:

An individual withdrawal request will validate through sbtc consensus rules if it’s WithdrawalRequestReport passes validation. The work for building the report is associated with #1308, while this ticket can be accomplished by using the report in the coordinator code path.

2.1 Acceptance Criteria:

• The coordinator uses consensus rules for filtering withdrawal requests

3. Related Issues and Pull Requests (optional):

• [Feature]: ☂ Validate withdrawal requests as part of bitcoin validation #741
• [Feature]: Implement query returning WithdrawalRequestReport #1308

4. Appendix

There are collective cap rules around withdrawals, where we may want to throttle the system so that not too much is withdrawn per bitcoin block. We haven't formalized what those rules should be, so that part of consensus rules doesn't need to be done with this ticket.