chore: Re-design streaming services.

[prmukherj]

Context

In previous PRs all the grpc services were properly segregated so that the low level grpc code remains in _grpc_services and the high level python layer in services. Now the streaming services also requires similar redesign. Moreover, there were instances of server_supports_v1 leaking in the python codebase.

Change Summary

1. Streaming services redesigned in a similar manner so that the grpc related code remains in the _grpc_services and the high level python code in streaming_services
2. There are no more leaking instances of server_supports_v1 in the PyFluent codebase.
3. The proto version handling, etc. have all been taken care of in the low level factory.
4. The PyFluent session code is much cleaner now with no unnecessary imports and having the services directly available via fluent_connection.service_factory.

Rationale

This was done to provide a clean segregation to the PyFluent users, so that in future other services can be plugged in with minimal effort.

Impact

No impact to users.
All tests running fine.

Services covered in this refactoring:

1. Datamodel Event Streaming
2. Datamodel Streaming
3. Events Streaming
4. Field Data Streaming
5. Monitor Streaming
6. Transcript Streaming

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[seanpearsonuk]

@prmukherj Please make the description detailed so that reviewers know where to look and for what.

[prmukherj]

@prmukherj Please make the description detailed so that reviewers know where to look and for what.

On it.

[seanpearsonuk]

General comments

1. GRPCServiceFactory and ServiceFactory both use internal conditionals where separate factories would make more sense. Use abstract factory pattern with some methods raising NotImplementedError in derived classes.
2. GRPCServiceFactory stores unused attributes.
3. error_state is plumbed all the way through into services where separate interceptors are eventually created - multiple times. intercept_channel should be created once in the factory and passed to each service. Error state is an unwanted service dependency.
4. Proto version attribute is too weakly typed.

[seanpearsonuk]

Initial comments from read through of _grpc_services.__init__.

[seanpearsonuk]

There's an inaccurate docstring regarding raw stubs:

class ServiceFactory:
    """Wraps raw gRPC stubs from ``GRPCServiceFactory`` in version-appropriate high-level service objects.