fix(bump)!: only add version files and staged changes

[marcusalstrom]

Description

Bump will now only add and commit version files along with any already committed changes. Any unstaged changes will remain unstaged.

NOTE: BREAKING CHANGE, since we added a new abstract method to VersionProvider any custom version provider will break. (open to any suggestions on how to avoid this)

Checklist

• Add test cases to all the changes you introduce
• Run ./scripts/format and ./scripts/test locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

Expected behavior

Only version files and already staged changes will be committed on bump.

Steps to Test This Pull Request

1. cz bump with unstaged changes
2. only version files (and any staged changes) will be added and committed, unstaged changes will remain unstaged

Additional context

References issue #1194

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.64%. Comparing base (120d514) to head (cf91a07).
Report is 460 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1261      +/-   ##
==========================================
+ Coverage   97.33%   97.64%   +0.31%     
==========================================
  Files          42       55      +13     
  Lines        2104     2594     +490     
==========================================
+ Hits         2048     2533     +485     
- Misses         56       61       +5     

Flag	Coverage Δ
unittests	97.64% <100.00%> (+0.31%)	⬆️

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