Updater: Add network ConnectionStateMonitor

Change-Id: I54847a54e1cb0bff262deb3e57cae30fcd85b26f

Updater: Move ConnectionStateMonitor to kotlin

Change-Id: I7e0a1f68b71afe620706813daf76258b0c1682ae

Updater: Improve ConnectionStateMonitor behaviour

- Keep updater app alive till device back online for network callback.
- Remove network callback once the internet is back.
- Wait 10 seconds before doing anything when the device is online.

Change-Id: I55e631cbf6cec9c19ec13e513a54ceaf10f8b2b9

Updater: Simplify activity status for cnstate monitor

Change-Id: I1a46444c35ce40c967a16cc8a5ae2d099e14d62e