[HIPIFY][FFT] Add cuFFT support

+ Add API_FFT support (data types and functions)
+ Add CUFFT_API_supported_by_HIP.md
+ Add simple_cufft.cu test
+ Update README.md

hipify-clang/src/HipifyAction.cpp

@@ -164,6 +164,10 @@ bool HipifyAction::Exclude(const hipCounter & hipToken) {
                   if (insertedDNNHeader) { return true; }
                     insertedDNNHeader = true;
                     return false;
+                case API_FFT:
+                  if (insertedFFTHeader) { return true; }
+                  insertedFFTHeader = true;
+                  return false;
                 default:
                     return false;
             }