feat(git): support parse git messages that have prefix emoji

[Jannchie]

🔗 Linked issue

• Resolve Raw commit emoji support #145

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Although not part of the conventionalcommits standard, it is common practice for git messages to be prefixed with emoji.
This PR allows parsing prefixed string emoji (e.g., :bug:) and Unicode emoji (e.g., 🐞).
I ran unit tests to make sure it wouldn't affect the original parsing. I also wrote the appropriate unit tests for emoji parsing.

Need for discussion
Theoretically, unless someone uses emoji to prevent commits from being added to the changelog, it's senseless. So I just modified the original regex.
If we must obey conventionalcommits, we may need to expose the regex to config.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[danielroe]

this seems fine to me - wdyt @pi0?

[pi0]

Nice!