Merge pull request #20367 from augustinmanecy:features2d-rw

**Merge with contrib**: https://github.com/opencv/opencv_contrib/pull/3003

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or other license that is incompatible with OpenCV
- [x] The PR is proposed to proper branch
- [ ] There is reference to original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake

modules/features2d/misc/java/test/BRISKDescriptorExtractorTest.java

@@ -0,0 +1,63 @@
+package org.opencv.test.features2d;
+
+import org.opencv.test.OpenCVTestCase;
+import org.opencv.test.OpenCVTestRunner;
+import org.opencv.features2d.BRISK;
+
+public class BRISKDescriptorExtractorTest extends OpenCVTestCase {
+
+    BRISK extractor;
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        extractor = BRISK.create(); // default (30,3,1)
+    }
+
+    public void testCreate() {
+        assertNotNull(extractor);
+    }
+
+    public void testDetectListOfMatListOfListOfKeyPoint() {
+        fail("Not yet implemented");
+    }
+
+    public void testDetectListOfMatListOfListOfKeyPointListOfMat() {
+        fail("Not yet implemented");
+    }
+
+    public void testDetectMatListOfKeyPoint() {
+        fail("Not yet implemented");
+    }
+
+    public void testDetectMatListOfKeyPointMat() {
+        fail("Not yet implemented");
+    }
+
+    public void testEmpty() {
+        fail("Not yet implemented");
+    }
+
+    public void testReadYml() {
+        String filename = OpenCVTestRunner.getTempFileName("yml");
+        writeFile(filename, "%YAML:1.0\n---\nname: \"Feature2D.BRISK\"\nthreshold: 31\noctaves: 4\npatternScale: 1.1\n");
+
+        extractor.read(filename);
+
+        assertEquals(31, extractor.getThreshold());
+        assertEquals(4, extractor.getOctaves());
+        assertEquals(1.1f, extractor.getPatternScale());
+    }
+
+    public void testWriteYml() {
+        String filename = OpenCVTestRunner.getTempFileName("yml");
+
+        extractor.write(filename);
+
+        String truth = "%YAML:1.0\n---\nname: \"Feature2D.BRISK\"\nthreshold: 30\noctaves: 3\npatternScale: 1.\n";
+        String actual = readFile(filename);
+        actual = actual.replaceAll("e([+-])0(\\d\\d)", "e$1$2"); // NOTE: workaround for different platforms double representation
+        assertEquals(truth, actual);
+    }
+
+}