refactor(provider): refactor "ASYNC_DIRECT" callback signature

[linrongbin16]

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[codecov]

Codecov Report

Attention: Patch coverage is 4.16667% with 23 lines in your changes missing coverage. Please review.

Project coverage is 82.43%. Comparing base (2c4fbf6) to head (2b51d13).

Files with missing lines	Patch %	Lines
lua/fzfx/cfg/_lsp_locations.lua	0.00%	14 Missing ⚠️
lua/fzfx/cfg/git_branches.lua	14.28%	6 Missing ⚠️
lua/fzfx/detail/general.lua	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #810      +/-   ##
==========================================
- Coverage   82.49%   82.43%   -0.07%     
==========================================
  Files          55       55              
  Lines        5329     5333       +4     
==========================================
  Hits         4396     4396              
- Misses        933      937       +4     

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