Include concrete device model in user agent (PSG-754)

[Johennes]

Fixes: #6742

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
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[Johennes]

@ismailgulek I hope you don't mind me assigning you directly since you already reviewed matrix-org/matrix-ios-sdk#1576 and this is essentially just a port. 😇

I rewrote AlamoFire's user agent code to Swift this time because, unlike in the SDK, all other involved files were already Swift, too.

[Johennes]

It's a little unfortunate to have to bundle this in all the extensions but I think we want the same user agent also for any networking done from extensions and luckily DeviceKit is rather small.

[codecov]

Codecov Report

Base: 10.04% // Head: 10.04% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (a1361ce) compared to base (5635bf7).
Patch coverage: 84.21% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6761   +/-   ##
========================================
  Coverage    10.04%   10.04%           
========================================
  Files         1490     1490           
  Lines       150805   150864   +59     
  Branches     60858    60870   +12     
========================================
+ Hits         15143    15160   +17     
- Misses      135108   135147   +39     
- Partials       554      557    +3     

Impacted Files	Coverage Δ
Config/CommonConfiguration.swift	84.96% <84.21%> (-0.76%)	⬇️
...xKit/Controllers/MXKAuthenticationViewController.m	17.04% <0.00%> (-1.92%)	⬇️
...ojiPicker/Data/EmojiMart/EmojiItem+EmojiMart.swift	95.34% <0.00%> (-0.31%)	⬇️
Riot/Modules/Settings/SettingsViewController.m	0.00% <0.00%> (ø)
...s/Room/Attachements/MXKAttachmentsViewController.m	0.00% <0.00%> (ø)
.../Utils/EventFormatter/MarkdownToHTMLRenderer.swift	85.95% <0.00%> (+0.11%)	⬆️

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[ismailgulek]

Couple of inline comments, otherwise lgtm.

[github-actions]

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[Johennes]

Hm, looks like AppInfo isn't currently available in the test target yet

❌  /Users/runner/work/element-ios/element-ios/Config/CommonConfiguration.swift:108:23: cannot find 'AppInfo' in scope

        let appInfo = AppInfo.current
          ^

[sonarcloud]

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