[TASK] FormEngine: Inline titles and expand / collapse

Fetch the last pieces from InlineRecordContainer record title
preparation to record title data provider.
Refactor InlineRecordContainer to be better readable.
Handle expand / collapse state within data provider to only
calculate all record fields if the record is opened. Not
always adding collapsed records to the calculation has
significant performance advantages especially in nested
inline scenarious.

Change-Id: I83a457bd798dc47cc12a8dfb096132394d6bd357
Resolves: #71353
Releases: master
Reviewed-on: https://review.typo3.org/44557


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>