feat: Respect format's aspect ratio in Preview and add resizeMode prop (#1817)

* feat(preview): respect format's aspect ratio

* fix: code guidelines and previewSize in PreviewView

* feat: add resizeMode 'cover' and 'contain' on Android

package/src/CameraProps.ts

@@ -111,6 +111,10 @@ export interface CameraProps extends ViewProps {
    * Selects a given format. By default, the best matching format is chosen.
    */
   format?: CameraDeviceFormat;
+  /**
+   * Specify how you want the preview to fit the container it's in
+   */
+  resizeMode?: 'cover' | 'contain';
   /**
    * Specify the frames per second this camera should use. Make sure the given `format` includes a frame rate range with the given `fps`.
    *