Move implementation to TouchVideoFrame.cpp

Currently, the implementation for TouchVideoFrame.h is done directly in
the header file.
But we are adding more logic into TouchVideoFrame, specifically, the
ability to rotate videoframes. Therefore, add a separate cpp file for
TouchVideoFrame.

Test: atest libinput_tests
The actual test is added in an upcoming commit
Bug: 123241238

Change-Id: I4463099d251ab49533d25dd9da7c344e1a7ac93e