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The assistant object now runs in its own thread and leverages an
external `SpeechProcessor` that uses two threads to scan for both
intents and speech in parallel on audio frames.
`AssistantEvent.assistant` is now modelled as an opaque object that
behaves the following way:
- The underlying plugin name is saved under `event.args['_assistant']`.
- `event.assistant` is a property that returns the assistant instance
via `get_plugin`.
- `event.assistant` is reported as a string (plugin qualified name) upon
event dump.
This allows event hooks to easily use `event.assistant` to interact with
the underlying assistant and easily modify the conversation flow, while
event hook conditions can still be easily modelled as equality
operations between strings.