[TASK] Cleanup ext:lowlevel

This change cleans up parts of ext:lowlevel by

* using constructor property promotion where possible
* using typesafe comparison for command option `dry-run`
* removing superfluous typehints in doc headers
* adding missing typehints in doc headers
* using strict comparison where possible
* adding function parameter type declaration where suitable
* adding missing function return types
* fixing a typo in `ProviderRegistry`

Resolves: #100158
Releases: main
Signed-off-by: Torben Hansen <derhansen@gmail.com>
Change-Id: I9a3cbf09652d1fec586f89965569c7d087bc7aa0
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78110


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Benni Mack <benni@typo3.org>