Ability to make points or bar sections editable (ideally with drag and drop)

Something like this:

Similar to what is possible with shapes when editable=True is set in the config: https://github.com/plotly/plotly.js/blob/master/src/plot_api/plot_config.js#L47

Changing the position of the point (or bar section) should:

• modify the underlying traces
• trigger an event like restyle or relayout
• be restricted based on the current state of the graph. In the example of the screenshot, it should only be possible that the bar region is moved to "China" or "Canada" and their respective x positions, since those are the available values. Similarly, the y position would be determined by the current "height" of the bar the region is moved to.

src/plot_api/plot_config.js の editable-shapes 設定から始め、要求されている点と棒セクションの編集とその動作を比較します。位置の変更が基になるトレースをどのように更新し、restyle または relayout イベントを発生させ、グラフで利用可能なカテゴリ値と棒の高さをどのように尊重するかを定義します。指定された制約のもとでこれらのインタラクションが機能すれば完了です。