chore: import upstream snapshot with attribution

cmake/FindNumPy.cmake

@@ -0,0 +1,40 @@
+# Find the Python NumPy package
+# PYTHON_NUMPY_INCLUDE_DIR
+# NUMPY_FOUND
+# will be set by this script
+
+if(NOT PYTHON_EXECUTABLE)
+  if(NumPy_FIND_QUIETLY)
+    find_package(PythonInterp QUIET)
+  else()
+    find_package(PythonInterp)
+    set(_numpy_out 1)
+  endif()
+endif()
+
+if(PYTHON_EXECUTABLE)
+  # write a python script that finds the numpy path
+  file(WRITE ${PROJECT_BINARY_DIR}/FindNumpyPath.py
+       "try: import numpy; print(numpy.get_include())\nexcept:pass\n")
+
+  # execute the find script
+  execute_process(
+    COMMAND "${PYTHON_EXECUTABLE}" "FindNumpyPath.py"
+    WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
+    OUTPUT_VARIABLE NUMPY_PATH
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+elseif(_numpy_out)
+  message(STATUS "Python executable not found.")
+endif()
+
+find_path(PYTHON_NUMPY_INCLUDE_DIR numpy/arrayobject.h
+          HINTS "${NUMPY_PATH}" "${PYTHON_INCLUDE_PATH}")
+
+if(PYTHON_NUMPY_INCLUDE_DIR)
+  set(PYTHON_NUMPY_FOUND
+      1
+      CACHE INTERNAL "Python numpy found")
+endif()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(NumPy DEFAULT_MSG PYTHON_NUMPY_INCLUDE_DIR)