feat(customize.py/test_cz_customize.py): inherit from ConventionalCom…

[AtticusZeller]

enable cz_customize default behavior follow ConventionalCommitsCz without trivial settings

Description

try to Enable cover cz_conventional_commits via [tool.commitizen.customize] #1270

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

[tool.commitizen]
name = "cz_customize"
tag_format = "$version"
version_scheme = "semver"
version_provider = "pep621"
update_changelog_on_bump = true
major_version_zero = true
changelog_incremental = false

[tool.commitizen.customize]
commit_parser = "^((?P<change_type>feat|fix|refactor|perf|docs|style|refactor|ci|BREAKING CHANGE)(?:\\((?P<scope>[^()\r\n]*)\\)|\\()?(?P<breaking>!)?|\\w+!):\\s(?P<message>.*)?"
changelog_pattern = "^((BREAKING[\\-\\ ]CHANGE|\\w+)(\\(.+\\))?!?):"
change_type_map = {"feat"="Feat","fix"="Fix","refactor"= "Refactor","perf"="Perf","docs"="Docs","style"="Style","ci"="CI"}

now [tool.commitizen.customize] will cover the ConventionalCommitsCz settings

Steps to Test This Pull Request

1. add example [tool.commitizen.customize] into your pyproject.toml
2. cz commit -a,select docs,cz ch --dry-run,docs item will appear in your CHANGELOG.md

here is my test-repo

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 97.48%. Comparing base (120d514) to head (dda73ba).
Report is 465 commits behind head on master.

Files with missing lines	Patch %	Lines
commitizen/cz/customize/customize.py	80.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1273      +/-   ##
==========================================
+ Coverage   97.33%   97.48%   +0.14%     
==========================================
  Files          42       55      +13     
  Lines        2104     2585     +481     
==========================================
+ Hits         2048     2520     +472     
- Misses         56       65       +9     

Flag	Coverage Δ
unittests	97.48% <80.00%> (+0.14%)	⬆️

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[AtticusZeller]

switch correct branch