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)

modules/features/test/test_descriptors_invariance.cpp

@@ -0,0 +1,34 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html
+
+#include "test_precomp.hpp"
+#include "test_invariance_utils.hpp"
+
+#include "test_descriptors_invariance.impl.hpp"
+
+namespace opencv_test { namespace {
+
+const static std::string IMAGE_TSUKUBA = "features2d/tsukuba.png";
+const static std::string IMAGE_BIKES = "detectors_descriptors_evaluation/images_datasets/bikes/img1.png";
+#define Value(...) Values(make_tuple(__VA_ARGS__))
+
+/*
+ * Descriptors's rotation invariance check
+ */
+
+INSTANTIATE_TEST_CASE_P(SIFT, DescriptorRotationInvariance,
+                        Value(IMAGE_TSUKUBA, []() { return SIFT::create(); }, []() { return SIFT::create(); }, 0.98f));
+
+INSTANTIATE_TEST_CASE_P(ORB, DescriptorRotationInvariance,
+                        Value(IMAGE_TSUKUBA, []() { return ORB::create(); }, []() { return ORB::create(); }, 0.99f));
+
+
+/*
+ * Descriptor's scale invariance check
+ */
+
+INSTANTIATE_TEST_CASE_P(SIFT, DescriptorScaleInvariance,
+                        Value(IMAGE_BIKES, []() { return SIFT::create(0, 3, 0.09); }, []() { return SIFT::create(0, 3, 0.09); }, 0.78f));
+
+}} // namespace