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

❌ Patch coverage is 11.23596% with 79 lines in your changes missing coverage. Please review.
✅ Project coverage is 11.73%. Comparing base (17b45aa) to head (0c34c9b).
⚠️ Report is 2093 commits behind head on develop.

Files with missing lines	Patch %	Lines
...Modules/Room/Settings/RoomSettingsViewController.m	0.00%	52 Missing ⚠️
...les/MatrixKit/Models/Room/MXKRoomBubbleComponent.m	5.88%	15 Missing and 1 partial ⚠️
...ules/Room/Members/RoomParticipantsViewController.m	0.00%	8 Missing ⚠️
Riot/Categories/MXRoom+Riot.m	81.81%	2 Missing ⚠️
Riot/Modules/Room/DataSources/RoomDataSource.m	0.00%	1 Missing ⚠️

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	54.78% <ø> (-0.02%)	⬇️
unittests	5.95% <11.23%> (+1.36%)	⬆️

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