Feat: Failure reason for Payment Failure

[reez]

Reason: Would be nice to see as a user why a payment failed. We show a user their payment details in PaymentDetailView, leverages PaymentDetails which has PaymentStatus which looks like:

public enum PaymentStatus {
    
    case pending
    case succeeded
    case failed
}

Where user should see this: User goes to main view and taps on payment to see the details. Right now they can see failed but no additional context.

Opened an Issue and draft PR on LDK Node. My suggestion is to add an associated reason to failed where we'd have access to something like:

public enum PaymentStatus {
    
    case pending
    case succeeded
    case failed(<reason>)
}