Move utility functions related to isFromSource to Input.h

Moving following function to a common file to avoid duplication.
1. isStylusHoverEvent
2. isFromMouse
3. isFromTouchpad
4. isFromDrawingTablet
5. isHoverAction
6. isMouseOrTouchpad

Test: atest inputflinger_tests
Bug: 245989146
Flag: EXEMPT refactor
Change-Id: I9538646f126e792897c525e7e698f6acde4aaa22