Outline handling of client audio stream

Lazy init streaming when clients connect to the endpoint
TODO note client cleanup upon disconnection

…dio support

Update mocked methods for compat with dinkum 0.1.0+
Add websocket dependencies for streaming client
Add apt dependencies to Dockerfile for Python module builds

Separate streaming dependencies from basic WS
Refactor streaming client code into a separate module

Handle streaming socket retry if too early
Implement streaming audio responses

Remove duplicate docstring not included in OpanAPI pages

Update docstring to note undocumented functionality may change

… tests

Add locking around session changes