[FEATURE] Mass-indexing of assets

The patch significantly improve the BE tool
module and add CLI commands for managing the Index.

Change-Id: Ib5ad2b22cefb4e536f9312cd287fe0a61b0c3aaa
Releases: 1.1.0
Fixes: #41555
Reviewed-on: https://review.typo3.org/22950
Reviewed-by: Fabien Udriot
Tested-by: Fabien Udriot