getrawmempool rpc response is incompatible with bitcoin core response

[lnliz]

getrawmempool rpc response is missing multiple fields like fees that make it impossible to use the rpc client with a vanilla bitcoin core node.
fees were added in bitcoin 0.17.0 almost 7 years ago: https://bitcoincore.org/en/releases/0.17.0/

i can look into creating a PR to make this parity but wanted to ask first if it's desired.

current response struct:

btcd/btcjson/chainsvrresults.go

Lines 468 to 478 in 09ba026

	type GetRawMempoolVerboseResult struct {
	Size int32 `json:"size"`
	Vsize int32 `json:"vsize"`
	Weight int32 `json:"weight"`
	Fee float64 `json:"fee"`
	Time int64 `json:"time"`
	Height int64 `json:"height"`
	StartingPriority float64 `json:"startingpriority"`
	CurrentPriority float64 `json:"currentpriority"`
	Depends []string `json:"depends"`
	}

bitcoin core:
https://bitcoincore.org/en/doc/28.0.0/rpc/blockchain/getrawmempool/