[cmake] Introduce TensorFlowSource-2.3.0-rc0Config (#2742)

This will introduce TensorFlowSource-2.3.0-rc0Config.cmake file to aquire 2.3.0-rc0 with `nnas_find_package()` method

ONE-DCO-1.0-Signed-off-by: SaeHie Park <[email protected]>

infra/cmake/packages/TensorFlowSource-2.3.0-rc0Config.cmake

@@ -0,0 +1,21 @@
+# find_package rejects version with extra string like "2.3.0-rc0"
+#
+# TODO Find a better way
+function(_import)
+  if(NOT DOWNLOAD_TENSORFLOW)
+    set(TensorFlowSource_FOUND FALSE PARENT_SCOPE)
+    return()
+  endif(NOT DOWNLOAD_TENSORFLOW)
+
+  nnas_include(ExternalSourceTools)
+  nnas_include(OptionTools)
+
+  envoption(TENSORFLOW_2_3_0_RC0_URL https://github.com/tensorflow/tensorflow/archive/v2.3.0-rc0.tar.gz)
+
+  ExternalSource_Download(TENSORFLOW DIRNAME TENSORFLOW-2.3.0-RC0 ${TENSORFLOW_2_3_0_RC0_URL})
+
+  set(TensorFlowSource_DIR ${TENSORFLOW_SOURCE_DIR} PARENT_SCOPE)
+  set(TensorFlowSource_FOUND TRUE PARENT_SCOPE)
+endfunction(_import)
+
+_import()