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

[linrongbin16]

Resolve #237 .

Regression Test

Platforms

• [ ] windows
• [x] macOS
• [ ] linux

Hosts

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

Functions

• [x] Use GitLink(!) to copy git link (or open in browser).
• [x] 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[bot]]

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).

:exclamation: 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 :warning:

Additional details and impacted files

```diff @@ 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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