Merge pull request #24548 from dkurt:qrcode_struct_append_decode

QR codes Structured Append decoding mode #24548

### Pull Request Readiness Checklist

resolves https://github.com/opencv/opencv/issues/23245

Merge after https://github.com/opencv/opencv/pull/24299

Current proposal is to use `detectAndDecodeMulti` or `decodeMulti` for structured append mode decoding. 0-th QR code in a sequence gets a full message while the rest of codes will correspond to empty strings.

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

modules/objdetect/include/opencv2/objdetect/graphical_code_detector.hpp

@@ -66,6 +66,10 @@ public:
     @param decoded_info UTF8-encoded output vector of string or empty vector of string if the codes cannot be decoded.
     @param points optional output vector of vertices of the found graphical code quadrangles. Will be empty if not found.
     @param straight_code The optional vector of images containing binarized codes
+
+    - If there are QR codes encoded with a Structured Append mode on the image and all of them detected and decoded correctly,
+    method writes a full message to position corresponds to 0-th code in a sequence. The rest of QR codes from the same sequence
+    have empty string.
     */
     CV_WRAP bool detectAndDecodeMulti(InputArray img, CV_OUT std::vector<std::string>& decoded_info, OutputArray points = noArray(),
                                       OutputArrayOfArrays straight_code = noArray()) const;
@@ -78,4 +82,4 @@ protected:
 
 }
 
-#endif
+#endif