TimelineKind refactor

[Velin92]

isLive has been replaced with a TimelineKind enum to allow a better handling of the pinned timeline

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.
⚠️	You seem to have made changes to views. Please consider adding screenshots.

Generated by 🚫 Danger Swift against da224a6

[pixlwave]

Awesome, this feels much clearer about what's going on and will scale much better if we add another type of timeline in the future. 🙌

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 77.21%. Comparing base (8c07397) to head (da224a6).
Report is 1 commits behind head on develop.

Files	Patch %	Lines
...ne/TimelineController/RoomTimelineController.swift	0.00%	5 Missing ⚠️
...urces/Services/Timeline/RoomTimelineProvider.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3193      +/-   ##
===========================================
- Coverage    77.21%   77.21%   -0.01%     
===========================================
  Files          719      719              
  Lines        57044    57033      -11     
===========================================
- Hits         44047    44036      -11     
  Misses       12997    12997              

Flag	Coverage Δ
unittests	68.18% <66.66%> (-0.03%)	⬇️

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