Allow init function in gRPC services by the compiler plugin

[BuddhiWathsala]

Description:
$title

[BuddhiWathsala]

Should we allow all the functions including init or only allow the init function? @daneshk @shafreenAnfar @dilanSachi WDYT?

[shafreenAnfar]

AFAIU, services can have any type of functions ? @rdhananjaya any thoughts ?

[BuddhiWathsala]

Yes, normal functions are allowed in services. Then, I think it is better to allow all the normal functions and remote methods. We can disallow only the resource methods since those are not usable in the gRPC context.

[rdhananjaya]

If we disallow regular member functions, we are forcing the programmers to write large methods. I don't think that's a good thing to do.