Add NavHandleLongPressInputConsumerTest.

Tests LPNH for the standard conditions (no flags or AGA configs).

Specifically tests:
 - Delegate stealing focus
 - Long press triggers with steady hold or slight slop
 - Up, cancel, or excessive slop cancels the long press
 - Touch ignored if outside the nav handle (not centered)

Things behind flags / AGA config which are not yet tested:
 - 2 stage detection (double timeout after small slop)
 - Deep press
 - Custom timeout from AGA

Fix: 353613291
Test: NavHandleLongPressInputConsumerTest
Flag: TEST_ONLY
Change-Id: I5ada3a07ccec9062ac22fa21b00d5a030f6d134a