The patch extracts TSFE->determineId() and its sub
methods from TSFE into TypoScriptFrontendInitialization
middleware.

The information created by these methods is modeled into
the new DTO PageInformation, which is added as
'frontend.page.information' request attribute before
handling other middlewares below. The non-internal old
properties within TSFE are set and kept as b/w compat
layer for now.

This is a powerful change: It allows us to reduce
dependencies to TSFE significantly, which we will
start to leverage with upcoming patches.

The patch is an intermediate change as such: Looking
at determineId() and its related methods makes clear
the code can benefit heavily from further refactoring.
The method could be ultimately extracted into
a service class that only returns the 'final'
PageInformation object, or throws exceptions for
'early' responses. To keep the patch reviewable at
this point, these refactorings will continue with
additiona...