fix: The permission workflow for the camera should now be OK

[g123k]

Hi everyone,

I have fixed many issues on this PR, but the main change is that it should work far better on iOS.
Basically:

• The PermissionListener was created twice -> singleton
• shouldShowRequestRationale always returns false on iOS, so the code now takes care of this
• (Really) ensure only one permission request can be asked at a given time

This PR will participate to improve #2741

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 7.16%. Comparing base (2ea0da3) to head (f4eaec2).
Report is 2150 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ages/smooth_app/lib/helpers/permission_helper.dart	0.00%	9 Missing ⚠️
packages/smooth_app/lib/pages/scan/scan_page.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #2763      +/-   ##
==========================================
- Coverage     8.86%   7.16%   -1.70%     
==========================================
  Files          161     218      +57     
  Lines         6623   10568    +3945     
==========================================
+ Hits           587     757     +170     
- Misses        6036    9811    +3775     

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[teolemon]

@g123k merging if that's ok

[g123k]

@g123k merging if that's ok

For me, it is :p

[teolemon]

I'd very much like to ship that quickly in order to have a clearer view on scan Issues

[g123k]

It should only change for iOS users, on Android, it should behave like before (which was OK)

[teolemon]

Which was not ok, I have several videos on my Pixel @g123k ?

[g123k]

Mmm could you please post one? Or pink an existing issue?

[teolemon]

screen-20220809-105500.mp4

[g123k]

I can't reproduce it, so let's say it's ok

[teolemon]

ok, let's merge and see