chore: Remove the matrix-sdk-crypto re-export in the matrix-sdk crate

[poljar]

• Public API changes documented in changelogs (optional)

[codspeed-hq]

CodSpeed Performance Report

Merging #5769 will not alter performance

_{Comparing poljar/remove-crypto-re-export (48b2f94) with main (588d604)}

Summary

✅ 50 untouched

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.42%. Comparing base (588d604) to head (48b2f94).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5769      +/-   ##
==========================================
- Coverage   88.43%   88.42%   -0.01%     
==========================================
  Files         360      360              
  Lines       99796    99796              
  Branches    99796    99796              
==========================================
- Hits        88250    88248       -2     
- Misses       7405     7407       +2     
  Partials     4141     4141              

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