[FEATURE] Add SEO fields to Pages TCA

This feature adds some new SEO fields to the Pages TCA. It also
introduces a new SEO tab containing all SEO related meta data. The
description field is moved to this tab. Other meta data that is not
important for SEO, is still on the Metadata tab.

Resolves: #84798
Releases: master
Change-Id: I75d47d2121d8cc40e10b8df926f2de6f68db6585
Reviewed-on: https://review.typo3.org/56769


Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Riny van Tiggelen <info@online-gamer.nl>
Reviewed-by: Gianluca Piccolo <gianluca.piccolo@pallino.it>
Tested-by: Gianluca Piccolo <gianluca.piccolo@pallino.it>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>