fix(ffi): Export Eq and Hash traits in enums used as HashMap keys

[Slko]

matrix_sdk_ffi::ruma::TagName and matrix_sdk_ffi::event::TimelineEventType enums that are used as HashMap keys by matrix_sdk_ffi::ruma::Tag and matrix_sdk_ffi::room::power_levels::RoomPowerLevels respectively should probably export Eq and Hash traits in the FFI as well, so that we can generate correct bindings for languages that implement UniFFI's record (in UDL)/HashMap (in proc-macros) type using a hash table (e.g. std::unordered_map in C++).

After applying these changes, I was able to generate working bindings using my WIP generator for C++ (that I haven't open-sourced yet).

Additional context: mozilla/uniffi-rs#2839

• I've documented the public API Changes in the appropriate CHANGELOG.md files.
• This PR was made with the help of AI.

[bnjbvr]

C++ bindings? 👀 Nice!

Let's see how Complement Crypto likes those new additions…

[Slko]

Oops, I wasn't familiar with that that test suite. I guess it doesn't like them. That makes everything much more complicated...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.90%. Comparing base (7c16d67) to head (609277e).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6259      +/-   ##
==========================================
- Coverage   89.90%   89.90%   -0.01%     
==========================================
  Files         372      372              
  Lines      102475   102475              
  Branches   102475   102475              
==========================================
- Hits        92135    92126       -9     
- Misses       6785     6790       +5     
- Partials     3555     3559       +4     

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[bnjbvr]

We're unfortunately stuck on older features of uniffi because Complement Crypto doesn't use the latest version. It's been updated recently, but it still might be a bit behind, or require some custom updates for the Go bindings generator 🤔

[codspeed-hq]

Merging this PR will not alter performance

✅ 50 untouched benchmarks

---

_{Comparing Slko:ffi-export-eq-hash (609277e) with main (deabb8b)}

[Slko]

Yeah, seems like enum traits require at least UniFFI 0.30 which contains non-trivial number of breaking changes and new features, and most generators (including uniffi-bindgen-go) are stuck on 0.29.x. This could probably be worked around with a feature flag, but I feel like it's not worth it for such a minor change.

[poljar]

Yeah, seems like enum traits require at least UniFFI 0.30 which contains non-trivial number of breaking changes and new features, and most generators (including uniffi-bindgen-go) are stuck on 0.29.x. This could probably be worked around with a feature flag, but I feel like it's not worth it for such a minor change.

Well there is hope: NordSecurity/uniffi-bindgen-go#88.