standalone-block-editor

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As requested in this https://github.com/getdave/standalone-block-editor/issues/6 this PR shows a PoC for adding undo/redo functionality to the standalone editor.

It's far from perfect as the real undo/redo functionality in the Post editor is more sophisticated and accounts for more scenarios.

That said it works at a basic level and should act as a good kicking off point.

Still need to fix things so minor undo levels aren't created.

Isolated Block Editor uses different actions to control the behaviour here. I need to look into this

https://github.com/Automattic/isolated-block-editor/blob/82b69eda507554c76b4afecc1f75987955c22e36/src/components/block-editor-contents/index.js#L91-L92