An internal csp-violation reporting endpoint is integrated, which
keeps track of potential violations in frontend and backend scope.
Alternative remote endpoints of 3rd party services can be configured
with in TYPO3_CONF_VARS setting `contentSecurityPolicyReportingUrl`
for `BE` or `FE`.

Violations ("reports") are visualized in the new
Content-Security-Policy backend module, which allows to select from
possible suggestions that would resolve a violation - however a user
with system maintainer privileges has to make this decision.

For the time being, the `GoogleMapsHandler` has been added, which
can be used as an inspiration for additional custom CSP violation
handlers. The following test extension triggers CSP violations:
https://packagist.org/packages/oliver-hader/csp-test

Resolves: #87423
Related: #99499
Releases: main
Change-Id: I7476b954c896c4d367d4e41e3d0f6f663952e966
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77998


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Torben Hansen <derhansen@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Torben Hansen <derhansen@gmail.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>