feat(crypto): Add forwarder_data to InboundGroupSession and pickle.

[kaylendog]

Issue: #5109

• Public API changes documented in changelogs (optional)

[codspeed-hq]

CodSpeed Performance Report

Merging #5943 will not alter performance

_{Comparing kaylendog/history_sharing/store_history_sender_details (f7c6e5f) with main (2522a36)}

Summary

✅ 50 untouched

[codecov]

Codecov Report

❌ Patch coverage is 92.68293% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.51%. Comparing base (2522a36) to head (f7c6e5f).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/matrix-sdk-crypto/src/store/mod.rs	88.23%	0 Missing and 2 partials ⚠️
...atrix-sdk-crypto/src/olm/group_sessions/inbound.rs	91.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5943   +/-   ##
=======================================
  Coverage   88.51%   88.51%           
=======================================
  Files         363      363           
  Lines      103432   103466   +34     
  Branches   103432   103466   +34     
=======================================
+ Hits        91548    91581   +33     
  Misses       7531     7531           
- Partials     4353     4354    +1     

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