[BUGFIX] Fix adding assets from uncached plugins

AssetCollector is a singleton, but of course does not survive requests.
Since uncached plugins should be able to access asset state from cached TypoScript
or other uncached plugins, we must make sure this state is serialized in the cache
(PageRenderer is serialized) and restored from cache.

Releases: master
Resolves: #90537

Change-Id: I6f954aecf0d83e0e81fca45167cdb31734af9e81
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63433


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Eßl <indy.essl@gmail.com>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>