This PR makes a few sweeping changes to the actor, cli, and overall
structure of the project.
- CLI commands skeleton
- ``arcade run``, ``arcade show``, and ``arcade new``
- Working package mangement solution (``arcade_`` packages)
- Actor approach for using frameworks other than FastAPI
- Client for calling Engine within ``arcade/core``
- beginning of the config interface.
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Co-authored-by: Nate Barbettini <nate@arcade-ai.com>
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