Selecting a table cell (or cells) through a model does not render a nice table selection

[Reinmar]

📝 Provide a description of the improvement

So. we not only have to handle selection done by the mouse, but also programmatically through the model. This will e.g. fix the undo which is not able to select cells right now.

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[jodator]

One thing is this check: https://github.com/ckeditor/ckeditor5-table/blob/3a2e025b7d3132a603d3bd5d814f76f8a5e1bf54/src/tableselection/converters.js#L24 and the TableSelection.hasMultipleCellSelection is used in various places.

The TableSelection does not restore or handle selection set elsewhere (ie by the model modification elsewhere).

This might require:

1. change for this check
2. how the TableSelection returns getSelectedTableCells

[Reinmar]

It may be worth resolving #6347 when working on this issue.

[jodator]

Check also: #6353.