feat(cli): add synergy between init and config flags

[xsadia]

Description

Allow user to define init file by passing --config alongside to --init
closes #932

Motivation and Context

How Has This Been Tested?

Ran locally using --init and --config flags together as well as separate to make sure there where no breaking changes

Screenshots / Logs (if applicable)

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 (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[welcome]

Thanks for opening this pull request! Please check out our contributing guidelines! ⛰️

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 42.72%. Comparing base (e85888f) to head (c5be59d).

Files with missing lines	Patch %	Lines
git-cliff/src/lib.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #992      +/-   ##
==========================================
- Coverage   42.85%   42.72%   -0.13%     
==========================================
  Files          21       21              
  Lines        1734     1737       +3     
==========================================
- Hits          743      742       -1     
- Misses        991      995       +4     

Flag	Coverage Δ
unit-tests	42.72% <0.00%> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.