Description

This PR implements configuration file support for the message_length_limit option, addressing issue #1571 . Previously, users could only set commit message length limits via command-line arguments (-l/--message-length-limit). Now they can define a default limit in their configuration file.

Checklist

• I have read the contributing guidelines

Code Changes

• Add test cases to all the changes you introduce
• Run poetry all locally to ensure this change passes linter check and tests
• Manually test the changes:
  • Verify the feature/bug fix works as expected in real-world scenarios
  • Test edge cases and error conditions
  • Ensure backward compatibility is maintained
  • Document any manual testing steps performed
• Update the documentation for the changes

Documentation Changes

• Run poetry doc locally to ensure the documentation pages renders correctly
• Check and fix any broken links (internal or external) in the documentation

Expected Behavior

Users can now set default commit message length limits in their configuration file:

[tool.commitizen]
message_length_limit = 72

Steps to Test This Pull Request

1. Test Configuration File Support

# Add the following to your pyproject.toml:
[tool.commitizen]
message_length_limit = 30
# Test with long message (should fail)
cz check -m "fix: this is a very long commit message that exceeds 30 characters"
# Test with short message (should pass) 
cz check -m "fix: short message"

2. Test CLI Override

# CLI argument should override config setting
cz check -m "fix: this message is longer than 30 chars but shorter than 60" -l 60
# Disable limit with CLI
cz check -m "fix: very long message that would normally fail config limit" -l 0

Additional Context