Change Details

This is a backport of core#16378 [2/3] https://github.com/bitcoin/bitcoin/pull/16378/commits/2c2a1445dc9d22c9d729b8301c8b3f54195bcfcf I also added "fee_rate", because I will use it in the next commit (Core doesn't bacause they use `conf_target` and `estimate_mode` to set the fee)

This is a backport of core#16378 [2/3] https://github.com/bitcoin/bitcoin/pull/16378/commits/2c2a1445dc9d22c9d729b8301c8b3f54195bcfcf Depends on D10263 I also added "fee_rate", because I will use it in the next commit (Core doesn't because they use `conf_target` and `estimate_mode` to set the fee)

This is a backport of core#16378 [2/3] https://github.com/bitcoin/bitcoin/pull/16378/commits/2c2a1445dc9d22c9d729b8301c8b3f54195bcfcf Depends on D10263 I also added "fee_rate", because I will use it in the next commit (Core doesn't babecause they use `conf_target` and `estimate_mode` to set the fee)