Add moved funds sweep trigger

[lukasz-zimnoch]

This task is about implementing a moved funds sweep action trigger in the client. All wallets that received moved funds must merge them without their own main UTXO. A possible problem to consider is multiple wallets doing this at the same time (may affect performance).

Important note: As for now, wallet actions are triggered using the wallet coordinator mechanism. However, there is ongoing work aiming to replace this mechanism with a better alternative. The moved funds sweep trigger must adhere to the new solution. See keep-network/tbtc-v2#737 for reference.

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1. Moved funds sweep proposal handling #3786
   📟 client +1