feat(timeline) - Expose shield state for EventTimelineItem

[BillCarsonFr]

Fixes #3667

• Public API changes documented in changelogs (optional)

Signed-off-by:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 84.25%. Comparing base (8e0282a) to head (6e4426a).
Report is 50 commits behind head on main.

Files	Patch %	Lines
...rates/matrix-sdk-ui/src/timeline/event_item/mod.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3679      +/-   ##
==========================================
- Coverage   84.27%   84.25%   -0.03%     
==========================================
  Files         259      259              
  Lines       26633    26638       +5     
==========================================
- Hits        22446    22444       -2     
- Misses       4187     4194       +7     

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