lnrpc+docs: deprecate warning SendToRoute, SendToRouteSync, SendPayment, and SendPaymentSync in Release 0.19

[mohamedawnallah]

Change Description

In this PR, we add deprecation warnings for SendToRoute, SendToRouteSync, SendPayment, and SendPaymentSync in preparation for their removal in the release after next (0.21).

Motivation and Context

Motivated by the discussion in this PR #8348.

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[bitromortac]

Looks good, thank you! The only question is if we want to give it more time and schedule the removal for 0.21, also since technically, we only deprecate SendPaymentSync and SendToRouteSync only with this PR @saubyk. It would be good to know how much usage those endpoints still see in popular projects.

[ziggie1984]

Moreover I think we should also highlight the corresponding REST methods here

[saubyk]

Ack