TouchedWindow: store tool type in addition to pointer id

Before this CL, we only stored the touching pointer id's inside
TouchWindow. However, it is also necessary to know which of the touching
pointers are touch vs stylus. This would allow us in a later CL to
determine whether the stylus is currently down anywhere on screen.

In this CL, instead of storing just the pointer ids, store
PointerProperties in a vector. This includes the pointer id and the
tooltype.

There should be no behaviour change in this CL.

Bug: 316225294
Test: TEST=inputflinger_tests; m $TEST && $ANDROID_HOST_OUT/nativetest64/$TEST/$TEST
Change-Id: I7fb2bbd46e7da7e085679ee16da3a53773931875