sweep+rpc: add support to bump fee of inputs/transactions #3140
In this PR, we add support to the
This RPC takes a different approach than
When bumping the fee of an input that currently exists within the
This RPC also serves useful when wanting to perform a Child-Pays-For-Parent (CPFP), where the child transaction pays for its parent's fee. This can be done by specifying an outpoint within the low fee transaction that is under the control of the wallet.
Note that this RPC currently doesn't perform any validation checks on the fee preference being provided. For now, the responsibility of ensuring that the new fee preference is sufficient is delegated to the user.
Depends on #3089.