Add "new app" info in bootloader -> microapp data

[mrquincle]

Across reboots it might be useful for certain parts of our code to know if it is booted with a new firmware for the first time.

Consider this concern about the MicroappManager using part of RAM to store information across reboots:

If these structs change with a firmware upgrade, things might be interpreted wrong.
Maybe move this to the protocol dir or so?

_Originally posted by @vliedel in https://github.com/crownstone/bluenet/pull/178#discussion_r944516970_

One of the ways this can be fixed is by adding more information into that RAM data. In this case versioning. That however needlessly adds version information and raises the question when the version has to be bumped and by whom.

This can be fixed by the bootloader wiping this part of RAM when new firmware is starting for the first time. However, that adds again functionality to the bootloader.

This can also be fixed by the bootloader better informing the app. There's already an IPC ram section defined for it. Also other code can benefit from this, for example for migration purposes.