[FEATURE] show parsed lucene query under search box

provides a new FormModifier to provide the marker ###FORM.DEBUG_QUERY###
which will display the parsed lucene query used by the current search if
showDocumentScoreAnalysis is set to true
Related: #28787
Releases: 3.0
Change-Id: I10b1bef874a5bed698f1af3f7033d59311c74bbc
Reviewed-on: https://review.typo3.org/25632
Reviewed-by: Ingo Renner
Tested-by: Ingo Renner