[TASK] Extend .phpstorm.meta.php for further autocompletion support

Extend PHPStorm meta file with further definitions for autocompletion
support and avoid unnecessary php docblocks in the code base.

* add request getAttribute() return types
* add return type for 'SiteMatcher->matchRequest()'
* add return type for 'PageRouter->matchRequest()'

Resolves: #96636
Related: #95064
Releases: main, 11.5
Change-Id: I7c2aafc8a0230090e267d9c4eb2f3e5284d8ee0a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73156


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>