feat(event cache): deduplicate using a store when available

[bnjbvr]

Based on the glorious work of #4659 and #4656, this introduces a new way to deduplicate events, whether we have enabled storage or not, using a plain old sum type 🤓 When storage is enabled by default for everyone, we can get rid of the BloomFilterDeduplicator and replace Deduplicator with the store-based one.

Part of #3280.

[codecov]

Codecov Report

Attention: Patch coverage is 93.02326% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.76%. Comparing base (1918bd5) to head (33f5621).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/matrix-sdk/src/event_cache/deduplicator.rs	91.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4662      +/-   ##
==========================================
+ Coverage   85.74%   85.76%   +0.01%     
==========================================
  Files         292      292              
  Lines       33723    33733      +10     
==========================================
+ Hits        28917    28932      +15     
+ Misses       4806     4801       -5     

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[Hywan]

Greeeeaaat! Can we have a couple of tests for the store based deduplicator? We already test filter_duplicated_events but one test to ensure the behaviour of retain works as expected would be nice :-). Thanks!