Merge pull request #26379 from cdcseacave:jxl_codec

Add jxl (JPEG XL) codec support #26379

### Pull Request Readiness Checklist

Related CI and Docker changes:
- https://github.com/opencv/ci-gha-workflow/pull/190
- https://github.com/opencv-infrastructure/opencv-gha-dockerfile/pull/44

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 another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work https://github.com/opencv/opencv/issues/20178
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/imgcodecs/test/test_read_write.cpp

@@ -157,6 +157,9 @@ const string exts[] = {
 #ifdef HAVE_JPEG
     "jpg",
 #endif
+#ifdef HAVE_JPEGXL
+    "jxl",
+#endif
 #if (defined(HAVE_JASPER) && defined(OPENCV_IMGCODECS_ENABLE_JASPER_TESTS)) \
     || defined(HAVE_OPENJPEG)
     "jp2",
@@ -238,6 +241,8 @@ TEST_P(Imgcodecs_Image, read_write_BGR)
     double psnrThreshold = 100;
     if (ext == "jpg")
         psnrThreshold = 32;
+    if (ext == "jxl")
+        psnrThreshold = 30;
 #if defined(HAVE_JASPER)
     if (ext == "jp2")
         psnrThreshold = 95;
@@ -268,6 +273,8 @@ TEST_P(Imgcodecs_Image, read_write_GRAYSCALE)
     double psnrThreshold = 100;
     if (ext == "jpg")
         psnrThreshold = 40;
+    if (ext == "jxl")
+        psnrThreshold = 40;
 #if defined(HAVE_JASPER)
     if (ext == "jp2")
         psnrThreshold = 70;