refactor: Use native async fn in traits for widget::CapabilitiesProvider

[jplatte]

The main thing left now are the store traits, unsure how to deal with those. dynosaur + trait_variant are kind of the modern replacement for async_trait, but (a) trait_variant seemed to generate invalid code here when I tried it and (b) even with that fixed I think the error type erasure is going to present some extra problems. Maybe it's fine to just keep the current solution for the store traits for now.

Signed-off-by: Jonas Platte [email protected]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.13%. Comparing base (b4146ca) to head (ad0787e).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5135      +/-   ##
==========================================
- Coverage   90.15%   90.13%   -0.03%     
==========================================
  Files         334      334              
  Lines      104717   104717              
  Branches   104717   104717              
==========================================
- Hits        94408    94385      -23     
- Misses       6255     6278      +23     
  Partials     4054     4054              

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[bnjbvr]

yay let's kill all uses of async-trait with 🔥 🔥 🔥 (as it has pathologically slowed down compilation in the past)