* Do not connect to the radio hardware within `_connect_zigpy_app`
* Make `connect_zigpy_app` public
* Create radio manager instances from config entries
* Cache device triggers on startup
* reorg zha init
* don't reuse gateway
* don't nuke yaml configuration
* review comments
* Fix existing unit tests
* Ensure `app.shutdown` is called, not just `app.disconnect`
* Revert creating group entities and device registry entries early
* Add unit tests
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Co-authored-by: David F. Mulcahey <david.mulcahey@icloud.com>
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