Omit `chart.js` from the package & Expose the plugin for registration

[ylkhayat]

Motivation 🔬

Trying to use this package with Yarn PnP setup failed due to different Chart object reference which gets the subscription of the plugin.

Changes & Concerns 💣

• Remove the chart.js which drastically reduces the package size

Before

After

• Subscription only happens if you register the plugin manually which is exported from the package right now
• This makes this update flexible and dynamic to whichever chart.js release
• Prettified the file according to the standard prettier config