FindMy Beaconing support#2731
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This patch adds integrated "airtag" functionality to nodes. When enabled, a node advertises an Apple FindMy / OpenHaystack "offline finding" beacon alongside its normal mesh duties. Nearby iPhones anonymously relay its encrypted location to Apple's servers, letting you locate a deployed node through the global Find My network. No extra
infrastructure, GPS, or cellular needed.
This is particularly useful for repeater nodes. To maximise coverage they are often deployed in
exposed, unattended, hard-to-reach spots — rooftops, towers, hilltops, remote solar sites — which
makes them especially prone to going missing, whether through theft, weather, a failed mount, or being forgotten. A FindMy beacon gives you a way to locate (or recover) such a node, or at least get a last-known position, without having to physically visit the site.
It can also be used to geofence a repeater, to send notifications when it's moving from the installed location,
which if great for repeater nodes that don't have a built in GPS (such as the popular wismesh repeater mini solar).
The beacon genrerating code is adapted from https://github.com/pix/heystack-nrf5x