Pinned items timeline implementation for the banner

[Velin92]

fixes #3072

Requires https://github.com/matrix-org/matrix-rust-sdk/pull/3773 to be merged

[github-actions[bot]]

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

Generated by :no_entry_sign: Danger Swift against 431a90cb48f5b89b3a29e089f609f2434a22a1bb

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
11.9% Duplication on New Code

See analysis details on SonarCloud

[sonarqubecloud[bot]]

Quality Gate passed

Issues
6 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[bot]]

Codecov Report

Attention: Patch coverage is 46.15385% with 77 lines in your changes missing coverage. Please review.

Project coverage is 77.72%. Comparing base (cdaa88e) to head (10702ce).

Files	Patch %	Lines
...urces/Screens/RoomScreen/RoomScreenViewModel.swift	22.85%	27 Missing :warning:
...om/RoomSummary/RoomMessageEventStringBuilder.swift	0.00%	27 Missing :warning:
.../Sources/Screens/RoomScreen/RoomScreenModels.swift	66.66%	10 Missing :warning:
...ices/Room/RoomSummary/RoomEventStringBuilder.swift	66.66%	4 Missing :warning:
...tX/Sources/Other/Extensions/AttributedString.swift	0.00%	3 Missing :warning:
...X/Sources/Screens/RoomScreen/View/RoomScreen.swift	50.00%	2 Missing :warning:
...ne/TimelineController/RoomTimelineController.swift	0.00%	2 Missing :warning:
...lineController/RoomTimelineControllerFactory.swift	0.00%	1 Missing :warning:
NSE/Sources/NotificationContentBuilder.swift	0.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3099      +/-   ##
===========================================
- Coverage    77.80%   77.72%   -0.09%     
===========================================
  Files          713      713              
  Lines        54994    55078      +84     
===========================================
+ Hits         42786    42807      +21     
- Misses       12208    12271      +63     

Flag	Coverage Δ
unittests	68.22% <46.15%> (-0.08%)	:arrow_down:

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