feat(command): add 'file' and 'rev' parameters

[linrongbin16]

Resolve #237 .

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.

[codecov]

Codecov Report

Attention: Patch coverage is 15.38462% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 75.80%. Comparing base (30ee162) to head (5af248c).

❗ Current head 5af248c differs from pull request most recent head 77df9a4. Consider uploading reports for the commit 77df9a4 to get more accurate results

Files	Patch %	Lines
lua/gitlinker.lua	15.38%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #238      +/-   ##
==========================================
+ Coverage   75.60%   75.80%   +0.20%     
==========================================
  Files           9        9              
  Lines         828      839      +11     
==========================================
+ Hits          626      636      +10     
- Misses        202      203       +1     

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