Add Whisper custom export to wheel (microsoft#15685)

### Description
This PR adds the Whisper custom export scripts to the wheel.



### Motivation and Context
This enables access to the custom export scripts in the wheel.

cmake/onnxruntime_python.cmake

@@ -464,6 +464,9 @@ file(GLOB onnxruntime_python_transformers_models_stable_diffusion_src CONFIGURE_
 file(GLOB onnxruntime_python_transformers_models_t5_src CONFIGURE_DEPENDS
     "${ONNXRUNTIME_ROOT}/python/tools/transformers/models/t5/*.py"
 )
+file(GLOB onnxruntime_python_transformers_models_whisper_src CONFIGURE_DEPENDS
+    "${ONNXRUNTIME_ROOT}/python/tools/transformers/models/whisper/*.py"
+)
 file(GLOB onnxruntime_python_datasets_srcs CONFIGURE_DEPENDS
     "${ONNXRUNTIME_ROOT}/python/datasets/*.py"
 )
@@ -520,6 +523,7 @@ add_custom_command(
   COMMAND ${CMAKE_COMMAND} -E make_directory $<TARGET_FILE_DIR:${build_output_target}>/onnxruntime/transformers/models/longformer
   COMMAND ${CMAKE_COMMAND} -E make_directory $<TARGET_FILE_DIR:${build_output_target}>/onnxruntime/transformers/models/stable_diffusion
   COMMAND ${CMAKE_COMMAND} -E make_directory $<TARGET_FILE_DIR:${build_output_target}>/onnxruntime/transformers/models/t5
+  COMMAND ${CMAKE_COMMAND} -E make_directory $<TARGET_FILE_DIR:${build_output_target}>/onnxruntime/transformers/models/whisper
   COMMAND ${CMAKE_COMMAND} -E make_directory $<TARGET_FILE_DIR:${build_output_target}>/onnxruntime/quantization
   COMMAND ${CMAKE_COMMAND} -E make_directory $<TARGET_FILE_DIR:${build_output_target}>/onnxruntime/quantization/operators
   COMMAND ${CMAKE_COMMAND} -E make_directory $<TARGET_FILE_DIR:${build_output_target}>/onnxruntime/quantization/CalTableFlatBuffers
@@ -616,6 +620,9 @@ add_custom_command(
   COMMAND ${CMAKE_COMMAND} -E copy
       ${onnxruntime_python_transformers_models_t5_src}
       $<TARGET_FILE_DIR:${build_output_target}>/onnxruntime/transformers/models/t5/
+  COMMAND ${CMAKE_COMMAND} -E copy
+      ${onnxruntime_python_transformers_models_whisper_src}
+      $<TARGET_FILE_DIR:${build_output_target}>/onnxruntime/transformers/models/whisper/
   COMMAND ${CMAKE_COMMAND} -E copy
       ${REPO_ROOT}/VERSION_NUMBER
       $<TARGET_FILE_DIR:${build_output_target}>