```
OutputGroup will handle the fee and effective value computations inside of Insert. It now needs to take the effective feerate and long term feerates as arguments to its constructor.
```
This is a partial backport of core#20040:
https://github.com/bitcoin/bitcoin/pull/20040/commits/99b399aba5d27476b61b4865cc39553d03965d57
Depends on D14018.