[FEATURE] Allow moving content elements via page tree

To make managing content across pages easier, a backend user may now
drag content elements from the "Page" module into a page in the page
tree.

Once dropped, a modal window will open where the backend user may select
the position where the content element shall be placed to, and also
change the target page again.

Resolves: #104935
Releases: main
Change-Id: Id4de849d02e36478af1c6fa780c2e4d495d6b41e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/86018


Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Andreas Nedbal <andy@pixelde.su>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Andreas Nedbal <andy@pixelde.su>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>