[Taproot] Checklist for protocol testing

[stark-3k]

This is a comprehensive list of scenarios that need to be handled during a swap. These include situations where the Taker/Maker could go offline and unresponsive during a swap or try to attack/exploit the protocol.

• Two maker single taker swap
• Multi maker single taker swap
• Multi taker multi maker swap
• Not enough makers
• Maker abort after AckResponse on SwapDetails
• Maker abort after SenderContract from Taker
• Intermediate Maker abort after SenderContractFromMaker
• Final Maker abort after SenderContractFromMaker
• Maker abort after PrivateKeyHandover by Taker
• Taker abort after AckResponse from Maker
• Taker abort after SenderContract from Taker
• Taker abort after SenderContractFromMaker
• Incoming contract timelock broadcast before PrivateKeyHandover
• Outgoing contract hashlock broadcast before PrivateKeyHandover