ENH: Add modern CMake linking to Filtering examples

Update all 60+ examples in Examples/Filtering to use specific ITK module
targets instead of ${ITK_LIBRARIES}. Examples now link to minimal required
modules with PRIVATE visibility and ITKImageIO for I/O.

Enhanced WhatModulesITK.py script with --link option to output
target_link_libraries commands. Fixed regex to parse module names across
multiple lines.

Author: blowekamp