feat: add argument to limit length of commit message in checks

[jwidauer]

Description

Recently there was an addition to add a message length limit in #1076.
However, those changes only applied to the cz commit command.
This PR also adds this new command line argument to the cz check command, to make checking for these violations possible.

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

When running cz check -l N -m MESSAGE with N being greater than the length of the header of MESSAGE, the check should fail.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.60%. Comparing base (120d514) to head (13334a6).
Report is 372 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1178      +/-   ##
==========================================
+ Coverage   97.33%   97.60%   +0.26%     
==========================================
  Files          42       55      +13     
  Lines        2104     2502     +398     
==========================================
+ Hits         2048     2442     +394     
- Misses         56       60       +4     

Flag	Coverage Δ
unittests	97.60% <100.00%> (+0.26%)	⬆️

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[Lee-W]

@jwidauer This is great! Thanks for adding this. I'm planning to merge it these days so that others would have a chance to take a look.