[BUGFIX] Prevent Inclusion of ResourceStorage from Bootstrap

During bootstrapping the ResourceStorage and ResourceFactory
is loaded and evaluated just because of two constants containing
signal names used in ext_localconf. This introduces unnecessary
overhead especially in eID context.

The constants have been extracted to an interface that are way
faster parsed.

Resolves: #56335
Releases: 6.2
Change-Id: I509593d2720c595fa7e4f1c9b5c63fd09fea724c
Reviewed-on: https://review.typo3.org/28416
Reviewed-by: Wouter Wolters
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe