Enhance Chromebook support / metrics

[mikehardy]

2 things going on:

1- I can't tell from the analytics currently what percentage of users are using a Chromebook (no indication of operating system or mobile device type), and I can't tell whether they are using the Chromebook Web Store version or an APK directly

2- I can't publish new releases to the Chrome Web Store. The chromebook release process fails starting on release 2.9alpha37 which unfortunately included the switch to AndroidX so I'm not sure this is a recoverable situation: https://github.com/ankidroid/Anki-Android/commits/master?after=ac527462170071626673b517d131e5c7f08a49a5+419

[mikehardy]

Solving #1 would require analyzing how google analytics reports device metrics by default (using their documentation) and putting the information we need into those fields. Something that differentiated ChromeOS from regular Android, and if possible differentiated how they installed it (via APK from Play Store - possible now on chromebooks, or via Chrome Web Store)

Solving #2 requires following this process https://github.com/ankidroid/Anki-Android/wiki/Release-procedure#chrome-web-store through the specific commits in the delta between 2.9alpha36 and 2.9alpha37, to see what broke and/or if there is any fix possible. Likely not.

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[mikehardy]

I want to keep this open - the analytics change should be easy and would tune how much priority we should give to ChromeOS support

[mikehardy]

I've got analytics now as of #6492 ! Chromebooks are almost exactly .1% (35 out of 35,000 users) of our demographics.
So they should work but not special effort should be undertaken.
Chrome web store is basically dead and chromebooks should install the main APK, as well.