Add json support for config

[danvergara]

Description

As mentioned in #120 , this PR add json support for configuration

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

Replace a TOML config file with a JSON config file with no side effects, (of course, passing the same arguments).

Steps to Test This Pull Request

1. Run the tests
2. Activate the virtual environment provided by the project/Poetry
3. Since the json files are supported for configuration, try to add a new file called .cz.json to customize Commitizen.

Additional context

Related to #120

[codecov]

Codecov Report

Merging #313 (8619322) into master (5486075) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #313      +/-   ##
==========================================
+ Coverage   96.97%   97.07%   +0.10%     
==========================================
  Files          33       34       +1     
  Lines         926      958      +32     
==========================================
+ Hits          898      930      +32     
  Misses         28       28              

Flag	Coverage Δ
unittests	97.07% <100.00%> (+0.10%)	⬆️

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Impacted Files	Coverage Δ
commitizen/commands/init.py	91.48% <100.00%> (+0.18%)	⬆️
commitizen/config/__init__.py	100.00% <100.00%> (ø)
commitizen/config/json_config.py	100.00% <100.00%> (ø)
commitizen/defaults.py	100.00% <100.00%> (ø)

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[Lee-W]

Thanks for your contribution! I just browse through it and it looks great! I'll clone it and test it locally to confirm again and then I think we can merge it 🎉

[Lee-W]

@danvergara You'll also need to handle the json format here so that cz init can run correctly

[danvergara]

@Lee-W thank you, man! I missed include the json support there!

[danvergara]

@Lee-W Done!

[Lee-W]

@danvergara I just confirmed it. Let's merge it!