[feature]: `QueryRoutes` should support multiple `outgoing_chan_id`

[feelancer21]

Is your feature request related to a problem? Please describe.
It is one building block to make pathfinding more efficient, especially for rebalancers.

Describe the solution you'd like
QueryRoutesRequest should support multiple outgoing_chan_id in the same way as SendPaymentRequest. The associated lncli command should also be adapted.

Describe alternatives you've considered
Non

[Abdulkbk]

I'd like to work on this and #10020 because they seem related.

[feelancer21]

@Abdulkbk I would appreciate it. Please keep me up to date when you have a first working version. Then I could build my PoC for #10021 on top of it.