feat(remote): support multiple remotes (origin/upstream)

[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.
• Use GitLink! to open git link in browser.
• Use GitLink blame to copy the /blame git link.
• Use GitLink! blame to open the /blame git link 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.

[codecov]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (f0e4c6f) 77.51% compared to head (2261415) 75.74%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
lua/gitlinker.lua	0.00%	28 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #166      +/-   ##
==========================================
- Coverage   77.51%   75.74%   -1.77%     
==========================================
  Files          11       11              
  Lines        1005     1006       +1     
==========================================
- Hits          779      762      -17     
- Misses        226      244      +18     

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[linrongbin16]

relate: #140