Update Hue Driver to accommodate 0.49.x changes for LAN Child Device Health

[dljsjr]

Changes in hubcore 0.49 require LAN-parented Child Devices to manage their online/offline state explicitly instead of automagically following the parent's health, which is needed to allow for child devices to mark themselves offline independently.

There were places in the Hue driver that made assumptions around child devices always following their parents, so we need to make a few tweaks to address that.

Primarily:

1. Bulbs call online() on themselves at the end of their init block;
2. The Hue Bridge will walk all of its children and manually update their state to offline when the bridge goes offline, and will poll the actual Zigbee connectivity status reported by the bridge when the bridge comes online.

The goal here is to try and minimize state divergence between local device watch and cloud health state; the cloud still has some rudimentary assumptions that child devices will follow parent devices, so we need to make the child devices behave the same way they would have in the past.

This supercedes #926 and #922

[github-actions]

Channel deleted.

[github-actions]

Minimum allowed coverage is 90%

Generated by 🐒 cobertura-action against dd63ac1

[github-actions]

Test Results

     52 files  ±0     336 suites  ±0   0s ⏱️ ±0s
1 577 tests ±0  1 577 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
2 732 runs  ±0  2 732 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit dd63ac1. ± Comparison against base commit d0eadcd.

♻️ This comment has been updated with latest results.