Feat/addional config ch

[TheNomet]

Description

Adding commit_parser, changelog_pattern, change_type_map as customizable fields in customize.py

I noticed that when customizing the tool, the changelog was not properly created, given the impossibility to specify a commit_parser. While adding the feature, I also added the possibility to specify a regex for changelog_pattern and the mapping contained in change_type_map.

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

Expected behavior

When creating a changelog with a user-defined regex, the changelog should have the correct entries.

Steps to Test This Pull Request

1. define a custom setup
2. check that the changelog is created correctly using the defined regex

[codecov]

Codecov Report

Merging #442 (58dac7c) into master (bc9be40) will increase coverage by 0.02%.
The diff coverage is 98.91%.

@@            Coverage Diff             @@
##           master     #442      +/-   ##
==========================================
+ Coverage   98.05%   98.08%   +0.02%     
==========================================
  Files          39       39              
  Lines        1441     1511      +70     
==========================================
+ Hits         1413     1482      +69     
- Misses         28       29       +1     

Flag	Coverage Δ
unittests	98.08% <98.91%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
commitizen/cli.py	97.61% <ø> (ø)
commitizen/commands/changelog.py	96.59% <95.45%> (-0.82%)	⬇️
commitizen/__version__.py	100.00% <100.00%> (ø)
commitizen/bump.py	100.00% <100.00%> (ø)
commitizen/changelog.py	97.25% <100.00%> (+0.77%)	⬆️
commitizen/commands/bump.py	95.19% <100.00%> (ø)
commitizen/cz/__init__.py	100.00% <100.00%> (ø)
commitizen/cz/customize/customize.py	95.08% <100.00%> (+0.85%)	⬆️
commitizen/defaults.py	100.00% <100.00%> (ø)
commitizen/exceptions.py	100.00% <100.00%> (ø)
... and 1 more

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[Lee-W]

Overall, the changes look good. Thanks for your contribution! Could you please add a test case to demonstrate how this affects changelog generation? Thanks!

[TheNomet]

Hi @Lee-W, thank you for taking the time to look at this!
I added the test you asked for, let me know if that is good enough or more is needed!

[Lee-W]

Great work @TheNomet !

@woile I've check this PR. It looks good to me Could you please take a brief look at this one when you have time? Thanks!

[Lee-W]

@woile I'll rebase and fix the conflicts if you're good with this feature. Thanks!

[woile]

I'm ok with it, go ahead

[Lee-W]

@TheNomet sorry for taking so long. Thanks so much for your contribution!

@woile I've rebased and read through this PR again. If there's no further comment, I'm planing on merging it tomorrow

[woile]

LGTM