routerrpc: add option PreventSubsequentPayment to TrackPaymentV2

[starius]

Change Description

The option is added to TrackPaymentV2's request. If it is enabled set and if the TrackPaymentV2 call is done before starting the payment, this fails a future payment with this payment hash.

If TrackPaymentV2 is only expected after starting a payment, you can use this flag to enforce the order of requests.

Changes in packages. In channeldb PaymentControl gets new method FetchOrIndalidatePayment which is similar to FetchPayment, but marks the payment invalid (FailureReasonTracked) in case it doesn't exist. Also added new PaymentStatus: StatusTracked. It is used for payments with FailureReasonTracked.

In package routing ControlTower gets an additional argument in method SubscribePayment: preventSubsequentPayment. If it is enabled and the payment hasn't started yet, it will be blocked in the future. It uses channeldb's new method FetchOrIndalidatePayment.

Steps to Test

make itest icase='tracked_payment_invalidates'

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[lightninglabs-deploy]

@bhandras: review reminder