Better support for carbonboard

[benoit-cty]

Description

Files Modified:

• ✏️ pyproject.toml - Renamed viz-legacy → carbonboard, removed redundant viz group, added backwards compatibility alias
• ✏️ codecarbon/viz/carbonboard.py - Added dependency checks with helpful error messages
• ✏️ docs/edit/visualize.rst - Added installation instructions and deprecation notice
• ✏️ CONTRIBUTING.md - Updated commands and added deprecation notice
• ✏️ .github/workflows/test-package.yml - Added CI steps for viz tests

Key Benefits:

• 🎯 Better UX: Users get clear error messages if dependencies are missing
• 🔄 Backwards Compatible: Existing viz-legacy installations continue to work
• 📚 Clear Documentation: Installation instructions are prominent and clear
• ✅ Better Testing: Viz tests now run automatically in CI
• 🧹 Cleaner Code: Removed redundant viz dependency group

This fully addresses issue #1009 and improves the overall developer and user experience!

Related Issue

Please link to the issue this PR resolves: [issue #1009]

Motivation and Context

Users don't know how to install carbnboard.

How Has This Been Tested?

pip install codecarbon[carbonboard]
carbonboard --filepath="examples/emissions.csv

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

Go over all the following points, and put an x in all the boxes that apply.

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING.md document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[inimaz]

Looks good thanks @benoit-cty !