refactor(commons): migrate to newest async library

[linrongbin16]

Regression Test

Platforms

• windows
• macOS
• linux

Hosts

• Test on github.com.
• Test on gitlab.com.
• Test on bitbucket.org.
• Test on codeberg.org.
• Test on git.samba.org.

Functions

• Use GitLink(!) to copy git link (or open in browser).
• Use GitLink(!) blame to copy the /blame link (or open in browser).
• Use GitLink(!) default_branch to open the /main//master link in browser (or open in browser).
• Use GitLink(!) current_branch to open the current branch link in browser (or open in browser).
• Copy git link in a symlink directory of git repo.
• Copy git link in an un-pushed git branch, and receive an expected error.
• Copy git link in a pushed git branch but edited file, and receive a warning says the git link could be wrong.
• Copy git link with 'file' and 'rev' parameters.

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.

Project coverage is 74.43%. Comparing base (8e193f0) to head (f76166b).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lua/gitlinker.lua	66.66%	2 Missing ⚠️
lua/gitlinker/linker.lua	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
+ Coverage   70.40%   74.43%   +4.03%     
==========================================
  Files          10        9       -1     
  Lines         963      845     -118     
==========================================
- Hits          678      629      -49     
+ Misses        285      216      -69     

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