Support gitignore

[theopomies]

Adds support for filtering out gitignored files

This feature adds a --gitignore CLI flag and a gitignore (optional) boolean key in the config file for filtering out gitignored files.

It makes use of the GitStatus and GitCache structures to provide this feature.

I wrote tests for the Config and Cli flag but couldn't figure out how to write integration tests, I didn't find any tests for the GitStatus or IgnoreGlobs features to take inspiration from.

This partially solves #218 and #342

TODO

• [x] Use cargo fmt
• [x] Add necessary tests
• [x] Update default config/theme in README (if applicable)
• [x] Update man page at lsd/doc/lsd.md (if applicable)

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[rkoten]

@zwpaper bumping this PR as a user who's interested in this functionality. Any blockers merging this?

[josselinonduty]

Any updates?

[theopomies]

@josselinonduty, I just merged it so it remains up to date, but still awaiting review from @zwpaper