Using a fixed-size ring buffer for direction estimation.

An ArrayDequeue has an internal variable-size array that can grow
unnecessarily when poping and adding elements to it. This CL makes sure
that we use a much simpler ring buffer to hold translations and estimate
directions.

Test: MagneticRowManagerImplTest
Test: presubmit
Test: manual. Verified notifications dismiss in the correct direction when flinging before and after detaching
Flag: com.android.systemui.magnetic_notification_swipes
Bug: 422250180
Change-Id: Ia7ca7d9a78edd6b8d1d79b32a9a79bcf8460087e