0.2.2 fixes and adding dodge options for grouped charts

[Chenglong-MS]

This pull request introduces version 0.2.2, bringing significant improvements to grouped chart rendering and chart property controls, especially for bar charts and violin plots across Vega-Lite, ECharts, and Chart.js. The update also refines rose chart behaviors and documentation, and fixes sorting and alignment issues. The most important changes are grouped below:

Grouped Chart Enhancements

• Grouped violin plots in Vega-Lite now render as split violins for two groups and as a grid for three or more, improving clarity over the previous overlapping mirror approach.
• Added local (compact) and global (aligned) dodge modes for grouped bar charts (Vega-Lite, ECharts, Chart.js) and boxplots (Vega-Lite, ECharts), selectable via the new dodge chart property. This makes sparse grouped data more readable. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

Chart Property and API Changes

• The dodge chart property options are now limited to auto, local, and global. The manual none option was removed, and one-per-band collapsing is now handled automatically. [1] [2]
• Documentation for Vega-Lite, ECharts, and Chart.js has been updated to describe the new dodge property and its options. [1] [2] [3] [4] [5]

Rose Chart Improvements

• The Vega-Lite Rose Chart no longer exposes an inner-radius control, aligning with the intended semantics (no donut hole). [1] [2]
• The "Sort slices" option in Vega-Lite Rose Charts now reliably reorders wedges and their legend by value.
• Chart.js Rose Chart alignment now correctly rotates wedges via the radial scale’s startAngle property, fixing a previous bug where the option was ignored. [1] [2] [3]

Versioning and Changelog

• Bumped version to 0.2.2 and updated the changelog and GitHub comparison links accordingly. [1] [2]

Bug Fixes

• Fixed sorting and alignment issues in Vega-Lite and Chart.js Rose Charts, ensuring correct visual and legend ordering.

These changes collectively improve grouped chart readability, streamline chart property controls, and resolve several chart rendering bugs.