feat: add author and author_email to git commit

[woile]

Extra useful information for hooks

Closes #188

Types of changes

• Bug fix
• New feature
• Refactoring
• Breaking change (any change that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe)

Description

Checklist

• Add test cases to all the changes you introduce
• Run ./script/format and ./script/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

[codecov]

Codecov Report

Merging #234 into master will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master     #234   +/-   ##
=======================================
  Coverage   95.70%   95.71%           
=======================================
  Files          34       34           
  Lines         955      957    +2     
=======================================
+ Hits          914      916    +2     
  Misses         41       41           

Flag	Coverage Δ
#unittests	95.71% <66.66%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
commitizen/commands/bump.py	90.58% <25.00%> (ø)
commitizen/__version__.py	100.00% <100.00%> (ø)
commitizen/git.py	95.55% <100.00%> (+0.10%)	⬆️

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