[ FEATURE REQUEST]: Support updating `service` parameters using gRPC

Plugin

Service

I have an idea!

Currently gRPC API allows us to create, terminate or get status of service.

I would also like to update at least some of these parameters.

This would enable me to adjust worker count, environment variables or if it should restart on demand, and keep the service running until it stops by itself when it wants to (not explicitly sending termination request). Next execution would then load the new configuration.