Add support for blocks in tables

After XWIKI-24157, the following content:

|one|two
|(((
* red
* green
)))|blue

produces this JavaScript exception:

Caused by: RangeError: Invalid content for node tableParagraph: <xwikiGroup>

Suggestion from Vincent Massol: detect this kind of limitations when converting the XWiki syntax to BlockNote (we can detect that the table cell has block-level content) and prevent BlockNote from loading, informing the user that BlockNote can't be used to edit the content, listing the reasons / limitations.