[FEATURE] Preview of plugins in the backend

It is now possible to render the preview of plugins
just like of regular content elements.

Resolves: #79225
Releases: master
Change-Id: Iab3fb50789135d5662ca3952a2de727b69090ce6
Reviewed-on: https://review.typo3.org/51223


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>