(ESP32) Fix bluetooth after light-sleep; de-init for deep-sleep

[todd-herbert]

Currently:

• When ESP32 devices enter light-sleep (power saving), BLE advertising is reset and disabled.
• If phone remains connected during light-sleep, it is possible to use BLE when the node wakes.
• If phone loses BLE connection during light-sleep, it is not possible to reconnect to the node.
• This does not appear to be an intentional behavior, and this "locked out" state does not appear to give any power savings.

Pull Request:

• When ESP32 device prepares to enter light-sleep, no calls to NimBLE to stop advertising.
• During light-sleep, advertising stops automatically, even without explicit calls to NimBLE. Power consumption measured same as with current code.
• After waking from light-sleep, BLE regains full normal function.
• NimBLE de-init enabled for ESP32 devices entering deep-sleep. Modest reduction in deep-sleep current. Device resumes normal BLE function after exiting deep-sleep.

[meshtastic-bot]

This pull request has been mentioned on Meshtastic. There might be relevant details there:

https://meshtastic.discourse.group/t/dodeepsleep-with-msectowake/12338/3