dnn: add the CANN backend (#22634)

* cann backend impl v1

* cann backend impl v2: use opencv parsers to build models for cann

* adjust fc according to the new transA and transB

* put cann net in cann backend node and reuse forwardLayer

* use fork() to create a child process and compile cann model

* remove legacy code

* remove debug code

* fall bcak to CPU backend if there is one layer not supoorted by CANN backend

* fix netInput forward

modules/dnn/test/test_common.impl.hpp

@@ -31,6 +31,7 @@ void PrintTo(const cv::dnn::Backend& v, std::ostream* os)
     case DNN_BACKEND_INFERENCE_ENGINE_NGRAPH: *os << "NGRAPH"; return;
     case DNN_BACKEND_WEBNN: *os << "WEBNN"; return;
     case DNN_BACKEND_TIMVX: *os << "TIMVX"; return;
+    case DNN_BACKEND_CANN: *os << "CANN"; return;
     } // don't use "default:" to emit compiler warnings
     *os << "DNN_BACKEND_UNKNOWN(" << (int)v << ")";
 }
@@ -251,7 +252,8 @@ testing::internal::ParamGenerator< tuple<Backend, Target> > dnnBackendsAndTarget
         bool withVkCom /*= true*/,
         bool withCUDA /*= true*/,
         bool withNgraph /*= true*/,
-        bool withWebnn /*= false*/
+        bool withWebnn /*= false*/,
+        bool withCann /*= true*/
 )
 {
     bool withVPU = validateVPUType();
@@ -311,6 +313,16 @@ testing::internal::ParamGenerator< tuple<Backend, Target> > dnnBackendsAndTarget
     CV_UNUSED(withWebnn);
 #endif
 
+#ifdef HAVE_CANN
+    if (withCann)
+    {
+        for (auto target : getAvailableTargets(DNN_BACKEND_CANN))
+            targets.push_back(make_tuple(DNN_BACKEND_CANN, target));
+    }
+#else
+    CV_UNUSED(withCann);
+#endif // HAVE_CANN
+
     {
         available = getAvailableTargets(DNN_BACKEND_OPENCV);
         for (std::vector< Target >::const_iterator i = available.begin(); i != available.end(); ++i)
@@ -477,6 +489,11 @@ void initDNNTests()
     registerGlobalSkipTag(
         CV_TEST_TAG_DNN_SKIP_TIMVX
     );
+#endif
+#ifdef HAVE_CANN
+    registerGlobalSkipTag(
+        CV_TEST_TAG_DNN_SKIP_CANN
+    );
 #endif
     registerGlobalSkipTag(
         CV_TEST_TAG_DNN_SKIP_ONNX_CONFORMANCE,