Support gitlab provider on command add repo

[kaduartur]

- What I did

• Added new provider to add repo (Gitlab)
• Separated git pkg in github and gitlab

- How to verify it

• Add new repo with rit add repo
• Run the unit tests with make unit-test command

- Description for the changelog
Add Gitlab provider to add repo

[codecov-commenter]

Codecov Report

Merging #350 into ritchie-2.0.0 will increase coverage by 0.07%.
The diff coverage is 59.78%.

@@                Coverage Diff                @@
##           ritchie-2.0.0     #350      +/-   ##
=================================================
+ Coverage          65.21%   65.28%   +0.07%     
=================================================
  Files                 78       80       +2     
  Lines               2550     2682     +132     
=================================================
+ Hits                1663     1751      +88     
- Misses               725      748      +23     
- Partials             162      183      +21     

Impacted Files	Coverage Δ
pkg/cmd/build_formula.go	0.00% <0.00%> (ø)
pkg/cmd/root.go	0.00% <0.00%> (ø)
pkg/cmd/update_repo.go	0.00% <0.00%> (ø)
pkg/credential/finder.go	68.42% <ø> (ø)
pkg/credential/settings.go	84.76% <0.00%> (-1.65%)	⬇️
pkg/formula/builder/bat.go	0.00% <0.00%> (ø)
pkg/formula/builder/local.go	72.54% <ø> (ø)
pkg/formula/formula.go	90.90% <ø> (ø)
pkg/formula/repo.go	0.00% <0.00%> (ø)
pkg/formula/runner/post_run.go	50.00% <ø> (ø)
... and 30 more

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[sandokandias]

Good job! 👍