[TASK] Add docs for database error "row size too large"

The patch adds an important.rst explaining details
around MySQL / MariaDB "row size too large" and
options to handle it.

Resolves: #104153
Related: #101553
Releases: main
Change-Id: I8727982e144ddefdeea3bb9c8c06179d2b414390
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84784


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Garvin Hicking <gh@faktor-e.de>