[FEATURE] Filter for select items

It is now possible to add a field to filter items of a select-type field.
An example must be added for this.

Resolves: #55465
Releases: 0.6
Change-Id: I112544a740fbb0146b4e865d336759c8cccb63ee
Reviewed-on: https://review.typo3.org/27152
Reviewed-by: Francois Suter
Tested-by: Francois Suter