* Create AutoFocusMarker and DefaultAutoFocusMarker
* Ensure onFocusEnd is called
* Add cameraAutoFocusMarker XML tag
* Update docs
* Fix changelog and migration guide
* Fix tests
* New getSurfaceSize internal method
* Rename setPreviewSize and all internals to setPreviewStreamSize
* Rename getSurfaceSize to getPreviewSurfaceSize
* New snapshotMaxWidth and snapshotMaxHeight APIs
* Add docs
* Improve rescaling logic
* Add tests