Incognito mode for large rooms used for announcements

[toshanmugaraj]

This changes related to #6989

Pull Request Checklist

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

• [ x] Pull request is based on the develop branch

• Pull request contains a changelog file in ./changelog.d
• [ x] 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: Shunmugaraj S toshanmugaraj@gmail.com
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[codecov]

Codecov Report

Base: 11.73% // Head: 11.73% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (0c34c9b) compared to base (17b45aa).
Patch coverage: 11.23% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6990   +/-   ##
========================================
  Coverage    11.73%   11.73%           
========================================
  Files         1620     1620           
  Lines       159271   159348   +77     
  Branches     64804    64839   +35     
========================================
+ Hits         18687    18702   +15     
- Misses      139940   140009   +69     
+ Partials       644      637    -7     

Flag	Coverage Δ
uitests	54.84% <ø> (+0.04%)	⬆️
unittests	5.95% <11.23%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
Riot/Modules/Room/DataSources/RoomDataSource.m	0.00% <0.00%> (ø)
...ules/Room/Members/RoomParticipantsViewController.m	0.00% <0.00%> (ø)
...Modules/Room/Settings/RoomSettingsViewController.m	0.00% <0.00%> (ø)
...les/MatrixKit/Models/Room/MXKRoomBubbleComponent.m	26.71% <5.88%> (-2.75%)	⬇️
Riot/Categories/MXRoom+Riot.m	1.97% <81.81%> (+1.97%)	⬆️
...castPlayback/View/VoiceBroadcastPlaybackView.swift	0.00% <0.00%> (ø)
...ojiPicker/Data/EmojiMart/EmojiItem+EmojiMart.swift	95.65% <0.00%> (+4.34%)	⬆️
RiotSwiftUI/Modules/Common/Mock/ScreenList.swift	90.19% <0.00%> (+5.88%)	⬆️

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