Allow devices to access details of the snapshot running on them

[robmarcer]

Description

When working with large sets of devices, it's fair to assume that during a migration to a new snapshot that some devices will continue to run the old snapshot for longer than others.

Where the devices are collecting data from sensors and passing it to a central time series database it would be useful if the data could be tagged as originating from a given snapshot.

That would allow HMIs both on the shop-floor and in offices to understand which data was generated by a specific snapshot and where needed highlight data from an old build.

[Steve-Mcl]

Verified staging -> device