Merge pull request #25986 from asmorkalov:as/js_for_contrib

Split Javascript white-list to support contrib modules #25986

Single whitelist converted to several per-module json files. They are concatenated automatically and can be overriden by user config.

Related to https://github.com/opencv/opencv/pull/25656

### 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 another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] 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/core/misc/js/gen_dict.json

@@ -0,0 +1,15 @@
+{
+    "whitelist":
+    {
+        "": [
+            "absdiff", "add", "addWeighted", "bitwise_and", "bitwise_not", "bitwise_or", "bitwise_xor", "cartToPolar",
+            "compare", "convertScaleAbs", "copyMakeBorder", "countNonZero", "determinant", "dft", "divide", "eigen",
+            "exp", "flip", "getOptimalDFTSize","gemm", "hconcat", "inRange", "invert", "kmeans", "log", "magnitude",
+            "max", "mean", "meanStdDev", "merge", "min", "minMaxLoc", "mixChannels", "multiply", "norm", "normalize",
+            "perspectiveTransform", "polarToCart", "pow", "randn", "randu", "reduce", "repeat", "rotate", "setIdentity", "setRNGSeed",
+            "solve", "solvePoly", "split", "sqrt", "subtract", "trace", "transform", "transpose", "vconcat",
+            "setLogLevel", "getLogLevel", "LUT"
+        ],
+        "Algorithm": []
+    }
+}