[R-W Bridge] Relayer economics

[EmmanuellNorbertTulbure]

Integrating rewards, batch transactions, delivery confirmations, signed extensions for refund and partial relayer payment.

Work Breakdown

• New relayer rewards scheme integration #1652
• DeliveryConfirmationPayments trait for paying relayer rewards at the source chain #1653
• Signed extension to refund relayer at the target chain #1657
• Batch transactions in complex relays #1669
• Pay partial relayer reward at the target chain #1648
• [R-W Bridge] (Fees) Redeploy to synch Rococo and Wococo with fees/weights/rewards #1677
• Fix ChainWithMessages::WeightInfo with correct values according to BridgeHub parachains #1640

[acatangiu]

I say for R<>W we can close this issue as done. We will get the full relayer economics picture when we look at P<>K bridge and also take into account all security audit feedback.