Support for MSC3906 v2

[hughns]

This PR adds support for v2 of MSC3906 which is used for Sign in with QR.

Both v1 and v2 are supported so compatibility is maintained.

Pull Request Checklist

• I read the contributing guide
• UI change has been tested on both light and dark themes, in portrait and landscape orientations and on iPhone and iPad simulators
• Accessibility has been taken into account.

• Pull request is based on the develop branch

• Pull request contains a changelog file in ./changelog.d
• You've made a self review of your PR
• Pull request includes screenshots or videos of UI changes
• Pull request includes a sign off

Signed-off-by: Hugh Nimmo-Smith hughns@element.io

[codecov]

Codecov Report

Patch coverage: 15.78% and no project coverage change.

Comparison is base (e0d6d1e) 12.13% compared to head (014f896) 12.13%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7407   +/-   ##
========================================
  Coverage    12.13%   12.13%           
========================================
  Files         1643     1643           
  Lines       162545   162557   +12     
  Branches     66743    66752    +9     
========================================
+ Hits         19727    19729    +2     
- Misses      142173   142183   +10     
  Partials       645      645           

Flag	Coverage Δ
uitests	55.24% <100.00%> (+<0.01%)	⬆️
unittests	6.00% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Riot/Modules/Rendezvous/RendezvousService.swift	77.77% <ø> (ø)
...ogin/Common/Service/MatrixSDK/QRLoginService.swift	6.88% <0.00%> (-0.20%)	⬇️
...Login/Common/Service/Mock/MockQRLoginService.swift	51.11% <100.00%> (+2.27%)	⬆️

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[stefanceriu]

lgtm 👍