feat: git-credential store hack

[profclems]

Description

This add git credential helper interface to glab.

• This sets up git HTTP(S) credentials after successfully logging in to glab.

→ gl auth login
? What GitLab instance do you want to log into? GitLab.com
- Logging into gitlab.com
? You're already logged into gitlab.com as profclems. Do you want to re-authenticate? Yes

Tip: you can generate a Personal Access Token here https://gitlab.com/profile/personal_access_tokens
The minimum required scopes are 'api' and 'write_repository'.
? Paste your authentication token: ********************
? Choose default git protocol HTTPS
? Authenticate Git with your GitLab credentials? Yes
? Choose host API protocol HTTPS
- glab config set -h gitlab.com git_protocol https
✓ Configured git protocol
- glab config set -h gitlab.com api_protocol https
✓ Configured API protocol
✓ Logged in as profclems

• Depend on git credentials for pull/push/clone commands

Before

→ git pull
Username for 'https://gitlab.com':

After running glab auth login and enabling the credential helper

→ git pull
remote: Enumerating objects: 1, done.
remote: Counting objects: 100% (1/1), done.
remote: Total 1 (delta 0), reused 0 (delta 0), pack-reused 0
Unpacking objects: 100% (1/1), 272 bytes | 272.00 KiB/s, done.
From https://gitlab.com/xxx/xxx/xxx.git
   63c6589..08e0dbe  dev        -> origin/dev
Already up to date.

Related Issue

Resolves #661
Resolves #707
Resolves #596

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation
• Chore (Related to CI or Packaging to platforms)

[zemzale]

Nice work. Did some manual testing and nothing seemed to be broken so LGTM.

[codecov]

Codecov Report

Merging #718 (65a7d41) into trunk (ab717b5) will decrease coverage by 0.48%.
The diff coverage is 29.14%.

@@            Coverage Diff             @@
##            trunk     #718      +/-   ##
==========================================
- Coverage   59.46%   58.97%   -0.49%     
==========================================
  Files          90       92       +2     
  Lines        6535     6626      +91     
==========================================
+ Hits         3886     3908      +22     
- Misses       2277     2339      +62     
- Partials      372      379       +7     

Impacted Files	Coverage Δ
commands/mr/create/mr_create.go	29.63% <0.00%> (+0.87%)	⬆️
commands/project/create/project_create.go	0.00% <0.00%> (ø)
commands/auth/login/login.go	40.00% <5.00%> (-2.03%)	⬇️
commands/auth/authutils/git_credentials.go	10.71% <10.71%> (ø)
commands/auth/login/helper.go	49.18% <49.18%> (ø)
commands/project/clone/repo_clone.go	62.22% <50.00%> (+0.41%)	⬆️
internal/config/config_type.go	68.92% <77.77%> (-0.20%)	⬇️
commands/auth/auth.go	100.00% <100.00%> (ø)
commands/auth/status/status.go	91.25% <100.00%> (ø)
internal/glrepo/repo.go	94.56% <100.00%> (-0.68%)	⬇️
... and 2 more

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