Add field to NodeDB entries indicating "favorite" status (which would also prevent them from DB removal

[rlmalisz]

Platform

NRF52, ESP32

Description

The title largely describes it. Currently, "favorite" is an abstraction present in the iOS app. This helps keep frequent DM targets top of node list on the phome. If this were actually a NodeDB attribute (settable via CLI), then devices could be pre-provisioned for use by ad hoc groups with no user setup required beyond device pairing, wtih these "favorites" already noted for other devices in the group.

[geeksville]

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

https://meshtastic.discourse.group/t/favorites-and-deletion-of-them/9623/2