Implement QR code scanner to join surveys

[andreia-ferreira]

Fixes #3639

This PR introduces a QR code reader in the survey selector screen so the user can join unlisted surveys more easily:

MicrosoftTeams-video.mp4

ML Kit was used even though technically we could re-use the ZXing library for reading QR codes. However, that would require a custom implementation, while ML Kit ships its own scanner UI as a Play Services module, so we don't have to build/maintain a camera Activity or handle camera permissions ourselves at runtime

The error handling in the survey selector was polished: errors from survey listing, activation, and QR scanning now route through a single ShowError with a ErrorType with the different variants, mapped consistently in the fragment to the right popup string

@shobhitagarwal1612 PTAL?

[codecov]

Codecov Report

❌ Patch coverage is 68.81720% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.06%. Comparing base (1fe9e57) to head (d93ea17).

Files with missing lines	Patch %	Lines
.../android/ui/surveyselector/SurveySelectorScreen.kt	48.78%	21 Missing ⚠️
...ndroid/ui/surveyselector/SurveySelectorFragment.kt	28.57%	3 Missing and 2 partials ⚠️
...droid/ui/surveyselector/SurveySelectorViewModel.kt	85.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3711      +/-   ##
============================================
+ Coverage     68.02%   68.06%   +0.04%     
- Complexity     1582     1592      +10     
============================================
  Files           362      365       +3     
  Lines          9284     9366      +82     
  Branches       1199     1207       +8     
============================================
+ Hits           6315     6375      +60     
- Misses         2313     2329      +16     
- Partials        656      662       +6     

Files with missing lines	Coverage Δ
.../groundplatform/android/system/GmsQrCodeScanner.kt	100.00% <100.00%> (ø)
...m/android/ui/surveyselector/SurveySelectorEvent.kt	100.00% <100.00%> (ø)
...g/groundplatform/domain/util/SurveyQrCodeParser.kt	100.00% <100.00%> (ø)
...droid/ui/surveyselector/SurveySelectorViewModel.kt	82.53% <85.00%> (+7.53%)	⬆️
...ndroid/ui/surveyselector/SurveySelectorFragment.kt	76.00% <28.57%> (-9.72%)	⬇️
.../android/ui/surveyselector/SurveySelectorScreen.kt	65.21% <48.78%> (-25.11%)	⬇️

... and 1 file with indirect coverage changes

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[shobhitagarwal1612]

Should this show a confirmation dialog with survey details before activating the survey?