MultiFingerGesture.isSloppyGesture Performance issue

[JRWilding]

Steps to reproduce

1. Perform a pinch to zoom gesture on a map with mapboxMap.uiSettings.isZoomGesturesEnabled = true

Expected behavior

Method is quick to return and doesn't churn memory.

Actual behavior

1. Methods handling touch events (similar to draw methods) should avoid allocations as they are frequently called. metrics = new DisplayMetrics()
2. Calls to get the display metrics are synchronized and can block - I've measured up to 4ms thread time (11ms wall) - e.g. windowManager.getDefaultDisplay().getRealMetrics()

As the comment suggests (line #143), this should be cached on touch down rather than called every move touch event
// As orientation can change, query the metrics in touch down

Configuration

Android versions: 6.0 -> 8.0
Device models: Pixel XL, Huawei P10, Samsung S7
Mapbox SDK versions: 7.3.x -> 7.4.0-beta.1