Request: Expose ignoreMutation option in Node Views

[thatsjonsense]

The problem I am facing
We're facing issues with nesting one Tiptap editor inside of a nodeview in another Tiptap editor. The problem is that when typing in the inner editor, we trigger selection changes on the parent editor. This leads to unnecessary rerenders on the parent views.

Marijn's suggestion was to use ignoreMutation in the nodeView config to block these selection changes.

Right now in NodeView.ts, all selections are being sent through:

    // ProseMirror should handle any selections
    if (mutation.type === 'selection') {
      return false
    }

The solution I would like
The option to send a custom ignoreMutation in Node Views, just like we can send a custom stopEvent.

I believe the change would be as simple as:

    if (typeof this.options.ignoreMutation === 'function') {
      return this.options.ignoreMutation(mutation)
    }

And the ability to pass ignoreMutation in ReactNodeViewRendererOptions.

Alternatives I have considered
We're currently hacking this by using a custom stopEvent and passing view.domObserver.suppressSelectionUpdates(), which seems to run before the mutation observer triggers. But this API is undocumented so we'd prefer to use Marijn's recommended approach.