routerclient: add EstimateRouteFeeWithRequest and deprecate EstimateRouteFee

[hieblmi]

• Add EstimateRouteFeeWithRequest to expose the full current LND EstimateRouteFee request surface:
  • graph-based estimates via Dest + Amount
  • payment-request probing via PaymentRequest
  • probe timeout via Timeout
• Add EstimateRouteFeeResponse so callers can access RoutingFee, TimeLockDelay, and FailureReason.
• Keep the existing EstimateRouteFee(ctx, dest, amt) method as a deprecated compatibility wrapper.
• Update macaroon recipe method mapping so the new wrapper maps to the existing /routerrpc.Router/EstimateRouteFee permission.
• Add unit tests for graph estimates, invoice probe estimates, legacy delegation, and timeout validation.

[lightninglabs-deploy]

@starius: review reminder

[starius]

EstimateRouteFeeWithRequest is oneof (old EstimateRouteFee , PaymentRequest + Timeout).

Wouldn't it be better to add another method for the PaymentRequest + Timeout variant and avoid EstimateRouteFee deprecation? Given the new method is split between these two variants anyway.