Create simple test suite for verifying Squish hooking

Create separate simple Squish test suite, which only verifies that installer and maintenancetool hooking works on linux, macOS and Windows.
Will be used in Squish update process, similar suites exists for Qt apps and Creator in
tqtc-qt-rta\suites\qttools\suite_squish_test_creator
tqtc-qt-rta\suites\qttools\suite_squish_test_qt_app

Name suite as 'suite_squish_test_ifw' and save to qttools.
Suite should be as simple as possible, and only purpose to verify that UI hooking works with Squish. At least with Qt online installer, maintenancetool also if needed.