notify sprig user if their firmware version is out of date

[JosiasAurel]

Note: This issue depends on #1298

It would be nice that when attempting to flash a game unto the Sprig console, the app checks whether or not firmware version on the user's console is out of date or not.

Relevant information

When flashing a game, the sprig editor communicates with the console via Web Serial

And the web editor checks for a particular message from the sprig console to determine whether or not the flashing was successful or not. We could include the firmware version number among these messages sent back-and-forth so that the sprig editor can check the current version of the firmware.

• Another relevant file here is src/rpi/upload.h in Spade