Merge pull request #26405 from kaingwade:rename_features2d

Rename features2d #26405

This PR renames the module _features2d_ to _features_ as one of the Big OpenCV Cleanup #25007. 
Related PR: opencv/opencv_contrib: [#3820](https://github.com/opencv/opencv_contrib/pull/3820) opencv/ci-gha-workflow: [#192](https://github.com/opencv/ci-gha-workflow/pull/192)

samples/cpp/tutorial_code/features/AKAZE_tracking/stats.h

@@ -0,0 +1,38 @@
+#ifndef STATS_H
+#define STATS_H
+
+struct Stats
+{
+    int matches;
+    int inliers;
+    double ratio;
+    int keypoints;
+    double fps;
+
+    Stats() : matches(0),
+        inliers(0),
+        ratio(0),
+        keypoints(0),
+        fps(0.)
+    {}
+
+    Stats& operator+=(const Stats& op) {
+        matches += op.matches;
+        inliers += op.inliers;
+        ratio += op.ratio;
+        keypoints += op.keypoints;
+        fps += op.fps;
+        return *this;
+    }
+    Stats& operator/=(int num)
+    {
+        matches /= num;
+        inliers /= num;
+        ratio /= num;
+        keypoints /= num;
+        fps /= num;
+        return *this;
+    }
+};
+
+#endif // STATS_H