Provide a device instance builder that allows plugins to easily
create multiple instance IDs based on parent attributes.
Also fix a lot of the instance ID orders, so that we add more generic
IDs first, and more specific IDs after.
A UF2 device exposes a VFAT block device (sometimes called a Mass
Storage Device) which has a virtual file called `INFO_UF2.TXT` where
metadata can be read. It may also have a the current firmware exported
as a file called `CURRENT.UF2` which is in a 512 byte-block UF2 format.
Writing any file to the MSD will cause the firmware to be written.
Sometimes the device will restart and the volume will be unmounted
and then mounted again. In some cases the volume may not “come back”
until the user manually puts the device back in programming mode.
Match the block devices using the VID*PID, UUID or label, and then
create a UF2 device which can be used to flash firmware.
Note: We only read metadata from allow-listed IDs to avoid causing
regressions on non-UF2 volumes. To get the UUID and label you can
use commands like:
udisksctl info -b /dev/sda1
