Add support in stringEnums

[mottiyudkin]

Feature Request

Add support in stringEnums

Is your feature request related to a problem? Please describe.

The generated values in the enums are numbers, but when we are working with enums: String we need to adapt each enum from int to string, it looks something like this

enum CarsFromProto {
  Audi = 1
}

enum Cars {
  Audi = "Audi"
}

Describe the solution you'd like

Add option to generate the enums with string values instead int values.
You can check how it's can be done in other libraries like ts-proto
With --ts_proto_opt=stringEnums=true, the generated enum types will be string-based instead of int-based.

What is the motivation / use case for changing the behavior?

Adding support for all users that want to use string enums