Add connection module exposing grpc server implementation

[chadqueen]

As a developer, I would like an encapsulated abstraction providing:

gRPC abstraction layer

• Stateless pass-through wrapper layer to grpc stubs with method signatures derived from ansys.geometry.core model entities

Server connection management

• Management of existing connections
• Reconnect management
• Establish connection to specific endpoint

[RobPasMue]

I will be taking the lead on this one starting on Monday. Thanks for creating it @chadqueen. Goals:

• Create a client class to connect to a server endpoint
• Check if "launch" mechanism is possible (launch the service) and implement it
• Manage multiple connections (as a possibility)
• Try to replicate the behaviour of other existing PyAnsys clients

The way in which we send over the information once we have the client is dependent on how we decide to structure our module. I'd wait for that part since it will depend on many architecture design issues we have open.