Break down input device usage by uid

When InputDispatcher notifies that there is an interaction between a
device and UIDs, track the usage of the input device by UID.

Since Dispatcher calls the policy from its own thread, we use an
AtomicQueue to hold the requests until we process the usages again from
the Reader thread.

Bug: 275726706
Test: atest inputflinger_tests
Test: statsd_testdrive
Change-Id: Ic4aae4bce7d3779adf23309973b964461bd92e7e