touchpad: add tap dragging configuration option

Support for tap dragging already exists in the Gestures library, so we
just have to pass the value in as a gesture property.

Bug: 321978150
Test: with the flag enabled, run `adb shell settings put system
    touchpad_tap_dragging 1`, try tap dragging (tapping then immediately
    putting your finger back on the touchpad and moving it)
Change-Id: Ib1a25899d30ae612fdd6fe0fcdad38a2669dc39b
diff --git a/services/inputflinger/tests/fuzzers/TouchpadInputFuzzer.cpp b/services/inputflinger/tests/fuzzers/TouchpadInputFuzzer.cpp
index be765cc..c2bf275 100644
--- a/services/inputflinger/tests/fuzzers/TouchpadInputFuzzer.cpp
+++ b/services/inputflinger/tests/fuzzers/TouchpadInputFuzzer.cpp
@@ -123,6 +123,7 @@
     config.touchpadPointerSpeed = fdp.ConsumeIntegralInRange(-7, 7);
     config.touchpadNaturalScrollingEnabled = fdp.ConsumeBool();
     config.touchpadTapToClickEnabled = fdp.ConsumeBool();
+    config.touchpadTapDraggingEnabled = fdp.ConsumeBool();
     config.touchpadRightClickZoneEnabled = fdp.ConsumeBool();
 }