Add support for the “Justify” alignment option in the AlignFeature of the LexicalEditor.

[ju4n97]

The AlignFeature in the lexicalEditor adapter currently supports “Left”, “Center”, and “Right” alignment options, as mentioned in this Discord question. It would be beneficial to include a “Justify” alignment option in payload side, as there are scenarios where this feature is needed.

[tallosim]

Completed and merged with #4868.