Draft: (vue-3) render node only once

[Rirax]

Please describe your changes

In this PR we change the way nodes are rendered into Vue components and held in locale state during content loading.

For each node in EditorContent.ts, the current node and all its predecessors are rendered for each new node, which implies a performance issue.

To avoid all nodes being rendered each time, we now keep the rendered nodes as a reference

How did you accomplish your changes

Since we cannot mutate the Editor props in render method of EditorContent, we move the logic to render a node in VueRenderer.ts.
Instead of keeping a Map of VueRenderer instance for each node, we keep the rendered VNodes in Map.

For each new node, we render it and add it to the existing Map.
The render method of EditorContent now retrieves the VNodes and renders them.

How have you tested your changes

[add a detailed description of how you tested your changes here]

How can we verify your changes

[add a detailed description of how we can verify your changes here]

Remarks

[add any additional remarks here]

Checklist

• The changes are not breaking the editor
• Added tests where possible
• Followed the guidelines
• Fixed linting issues

Related issues

Link to the related issues here

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[bdbch]

@Rirax LGTM but it seems there is a test failing in a Vue demo (regarding a Vue demo for the Drawing example).
Could you verify and maybe take a look at that?