Add all scanned devices to the scan list, but publish only the ones with public addresses

[gromeck]

All devices with public addresses should be listed and published as it is done right now.
In addition all non-public addresses should be listed and the total number should be published. If a device is no longer seen as a configurable time, it should be removed from the list.
This could be used as an indicator of how many devices are present -- and how many people are around.

[wprinz]

In this context it is interesting to note that some devices publish their address_type as BLE_ADDR_RANDOM (0x01) although their mac address address is stable. A reason for this is that they avoid the registration of their device to save the registration fee. E.g. the WeatherXm weather station provides a stable mac address but it publishes the address type 0x01. The manufacturer_id is published as 0xFFFF which is ment to be used only for testing purposes: https://devzone.nordicsemi.com/f/nordic-q-a/7424/is-it-mandatory-to-send-the-send-the-manufacturing-id-in-the-ble-advertising-packet