Add a small but nice wrapper around autogenerated code

[bvdmitri]

This PR adds a small wrapper around autogenerated code. The wrapper isn't doing much at the moment, but it will be expanded in the future. For now the basic API looks like:

from rxinferclient import RxInferClient

client = RxInferClient()

# Ping the server to check if it's running
response = client.server.ping_server()
print(response)

# Create a model instance
response = client.models.create_model_instance({ 
    "model_name": "BetaBernoulli-v1"
})
instance_id = response.instance_id

# Delete the model instance
client.models.delete_model_instance(instance_id=instance_id)