Feature Request: Activity Meter with Forwards only, not payments

[zapomatic]

Is your feature request related to a problem? Please describe.
Now that there are many ways and reasons to send funds over a channel, the Activity Meter is becoming less useful as an overall meter. For instance, I have channels that use PeerSwap and I will swap LN to them for L-BTC, or vice versa. This is recorded in the Activity meter, which hides the information of whether or not I have balanced routing activity with that node (it can show that 10M has flowed to me, and that I've sent 10M out, but in reality the whole 10M to me was PeerSwapped so I have zero routing activity to that node).

Describe the solution you'd like
An overall activity meter might still be desired and it wouldn't be good to change that behavior for backward compatibility, but it would be super useful to have a "Forwarding" meter that only considers forwarding traffic.

Describe alternatives you've considered
LNDg splits up Payments, and Invoices (PeerSwaps show up as Invoices), but LNDg does not have the meters that make Thunderhub instantly useful for quick viewing of channel activity.