Check if cursor has moved out of viewport bounds in CursorController

This CL updates CursorController to check if and which boundary the
cursor has crossed. This will be used to enable cursor moving between
different connected displays.

Test: atest inputflinger_tests
Test: verify cursor can move between displays as expected
Bug: 367660694
Flag: com.android.input.flags.connected_displays_cursor
Change-Id: Ida11e897d4e6767549dcc40da5c83e4c6be178c9