Merge pull request #24271 from Kumataro:fix24163

Fix to convert float32 to int32/uint32 with rounding to nearest (ties to even). #24271

Fix https://github.com/opencv/opencv/issues/24163

### 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
- [x] There is a reference to the 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.
- [x] The feature is well documented and sample code can be built with the project CMake

(carotene is BSD)

doc/tutorials/introduction/config_reference/config_reference.markdown

@@ -585,6 +585,7 @@ Following options can be used to change installation layout for common scenarios
 | `BUILD_FAT_JAVA_LIB` | _ON_ (for static Android builds) | Build single _opencv_java_ dynamic library containing all library functionality bundled with Java bindings. |
 | `BUILD_opencv_python2` | _ON_ | Build python2 bindings (deprecated). Python with development files and numpy must be installed. |
 | `BUILD_opencv_python3` | _ON_ | Build python3 bindings. Python with development files and numpy must be installed. |
+| `CAROTENE_NEON_ARCH` | '(auto)' | Switch NEON Arch for Carotene. If it sets nothing, it will be auto-detected. If it sets 8, ARMv8(and later) is used. Otherwise, ARMv7 is used. |
 
 TODO: need separate tutorials covering bindings builds