Added space_in_paren to the CSS options

[ninio]

The default value is false to keep the current behaviour as-is
Added both JS and Py implementations
Added unit tests for the space_in_paren option

Description

• Source branch in your fork has meaningful name (not master)

Fixes #1856

Before Merge Checklist

These items can be completed after PR is created.

(Check any items that are not applicable (NA) for this PR)

• JavaScript implementation
• Python implementation (NA if HTML beautifier)
• Added Tests to data file(s)
• Added command-line option(s) - It's already documented, but was not applied for CSS beautification.
• README.md documents new feature/option(s) - It's already documented, but was not applied for CSS beautification.

[bitwiseman]

Thanks for contributing!

Additional testing needed.

You might also try using a matrix config for the test. That way you can can supply a few inputs and generate the expected outputs like in the example below.

https://github.com/beautify-web/js-beautify/blob/3f1fff2b0ab58833806e9487de9b89945a371e46/test/data/css/tests.js#L1670-L1714

[bitwiseman]

Please add another test where the input has multiple spaces in inside the paren, example: 'width: min(. 100%. , 100vw. );',. In the case the extra spaces should be removed.

[ninio]

Thanks for the feedback! Will add them in the coming week.

[bitwiseman]

@ninio Do you have time to update this?