Merge pull request #20490 from TolyaTalamanov:at/support-fp16-input-precision

[G-API] Support FP16 input precision for IE backend

* Support fp16 input precision IE backend

* Add support to wrapIE

modules/gapi/src/backends/ie/giebackend.cpp

@@ -108,6 +108,7 @@ inline IE::Precision toIE(int depth) {
     case CV_8U:  return IE::Precision::U8;
     case CV_32S: return IE::Precision::I32;
     case CV_32F: return IE::Precision::FP32;
+    case CV_16F: return IE::Precision::FP16;
     default:     GAPI_Assert(false && "IE. Unsupported data type");
     }
     return IE::Precision::UNSPECIFIED;
@@ -161,6 +162,7 @@ inline IE::Blob::Ptr wrapIE(const cv::Mat &mat, cv::gapi::ie::TraitAs hint) {
         HANDLE(8U, uint8_t);
         HANDLE(32F, float);
         HANDLE(32S, int);
+        HANDLE(16F, int16_t);
 #undef HANDLE
     default: GAPI_Assert(false && "IE. Unsupported data type");
     }