refactoring code to use proper views in the UI and turned the camera instance into its own view with callbacks.

Also added in the model for initial use, and working to create the inferences off of TFLite using that view.

lib/utils/stats.dart

@@ -0,0 +1,23 @@
+/// Bundles different elapsed times
+class Stats {
+  /// Total time taken in the isolate where the inference runs
+  int totalPredictTime;
+
+  /// [totalPredictTime] + communication overhead time
+  /// between main isolate and another isolate
+  int totalElapsedTime;
+
+  /// Time for which inference runs
+  int inferenceTime;
+
+  /// Time taken to pre-process the image
+  int preProcessingTime;
+
+  Stats(this.totalPredictTime, this.totalElapsedTime, this.inferenceTime,
+      this.preProcessingTime);
+
+  @override
+  String toString() {
+    return 'Stats{totalPredictTime: $totalPredictTime, totalElapsedTime: $totalElapsedTime, inferenceTime: $inferenceTime, preProcessingTime: $preProcessingTime}';
+  }
+}