feature request: allow sweeping funds to multiple addresses during recovery

[josibake]

instead of only allowing a single destination address, allow users to provide an array of addresses, i.e ['bc1pa..', 'bc1pb..',].

ideally, allow addresses and amounts, ['bc1pa..': 6.15, 'bc1pb..': 21,], so long as the user provides at least one address with no amount specified. this is similar to the behavior of the proposed bitcoin core RPC sendall: bitcoin/bitcoin#24118

why?

much better for privacy, as transactions can be made to look like a coinjoin / batch exchange withdrawal, etc. sweeping all funds to a single address is bad for privacy as it reveals common ownership of the UTXOs and leaks the wallet balance. this also can be great for usability as sometimes when migrating from wallet to another, it's better to start out with multiple UTXOs of different sizes vs one giant UTXO