Support selecting and deselecting media blocks with arrow keys.
Support moving selection to a next block with ENTER while media block is selected.
Support moving selection to a previous block with SHIFT + ENTER while media block is selected.
This can be achieved by adding more prosemirror plugins with keyboard shortcuts handling or by using blocknote's onSelectionChange hook. Both solutions are simple to implement, but since we already have node selections logic in prosemirror plugins we would have to combine them into one single extension or rewrite the logic with blocknote.