[TASK] Allow configuring the modal size via markup trigger

When triggering modals via the `.t3js-modal-trigger` class, it is now
possible to configure a modal's size via the `data-size` attribute,
accepting all modal sizes:

* `small`
* `default`
* `medium`
* `large`
* `full`

Resolves: #101867
Releases: main, 12.4
Change-Id: I3932c3b3d9ee23904077e21a7362667d831dafc7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80895


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>