feature(sdk): faciliate using namespaces with remote graphs

[seriousben]

This PR removes the need for any workaround to use namespaces by supporting a IndexifyClient in the RemoteGraph class methods.

Deploying, Running, Outputting will reuse the same client which can be configured with a namespace.

Some docstring formatting was also done.

Testing

• Manual testing passing client

    client = IndexifyClient(namespace="object_detection")
    g = RemoteGraph.deploy(g, client=client)

• Manual testing backward compatible

   g = RemoteGraph.deploy(g)

• Run make fmt.
  Not needed

• pip install -e ., start server and executor, cd to python-sdk/tests, python test_graph_behaviours.py.

   .
   ----------------------------------------------------------------------
   Ran 7 tests in 1.578s
   
   OK
  

[diptanu]

Looks good