Smesher GRPC Debug Service shares API with Node v1 GRPC Debug service.

[fasmat]

Description

#6713 introduces a GRPC Debug service for the smesher application. This service shares its API with the v1 GRPC Debug service of the node.

This causes most endpoints of the service to return "Not implemented" when called, since those are not needed/sensible to implement for the smesher service, additionally the v1 GRPC API will eventually be retired in the (hopefully) near future.

To improve this define a dedicated API for the debug service of the smesher.

Affected code

See discussion here: #6713 (comment)