feat(timeline): handle live aggregations on non-live timelines

[bnjbvr]

This makes it possible to handle reactions/redactions/edits/etc. on non-live timelines. As a result, the pinned and focused timelines will now get live reactions/redactions and so on. This makes it possible to also have the thread timelines handle those live events, although it's unclear how it will pane out in the end, when the event cache is also involved.

Fixes #4823.
Fixes #4643.
Part of #4869.

[codecov]

Codecov Report

Attention: Patch coverage is 55.91398% with 41 lines in your changes missing coverage. Please review.

Project coverage is 85.84%. Comparing base (6f8b744) to head (746bbca).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...dk-ui/src/timeline/controller/state_transaction.rs	45.07%	39 Missing ⚠️
...rates/matrix-sdk-ui/src/timeline/controller/mod.rs	85.71%	1 Missing ⚠️
...tes/matrix-sdk-ui/src/timeline/controller/state.rs	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5060      +/-   ##
==========================================
- Coverage   85.90%   85.84%   -0.06%     
==========================================
  Files         325      325              
  Lines       35943    36027      +84     
==========================================
+ Hits        30876    30927      +51     
- Misses       5067     5100      +33     

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[andybalaam]

Looks good, thanks!