Add room moderation feature flag

[jmartinesp]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

• Added room moderation feature flag.

Motivation and context

I completely forgot to add this before merging #2423 😅 .

Tests

• Open the developer settings, make sure 'room moderation' is disabled.
• Go to a room where you're an admin. The 'roles and permissions' item shouldn't appear.
• Now enable the feature flag.
• Go back to the room: the item should be there.

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 72.94%. Comparing base (b9d902e) to head (442dfbc).

Files	Patch %	Lines
.../features/roomdetails/impl/RoomDetailsPresenter.kt	50.00%	0 Missing and 1 partial ⚠️
...ries/featureflag/impl/StaticFeatureFlagProvider.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2495   +/-   ##
========================================
  Coverage    72.94%   72.94%           
========================================
  Files         1387     1387           
  Lines        33176    33184    +8     
  Branches      6432     6432           
========================================
+ Hits         24200    24207    +7     
- Misses        5619     5620    +1     
  Partials      3357     3357           

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