hooks: add hook for metpy

Basic hook that collects metadata and data files.

news/60.new.rst

@@ -0,0 +1 @@
+Add hook for ``metpy``.

src/_pyinstaller_hooks_contrib/hooks/stdhooks/hook-metpy.py

@@ -0,0 +1,21 @@
+# ------------------------------------------------------------------
+# Copyright (c) 2021 PyInstaller Development Team.
+#
+# This file is distributed under the terms of the GNU General Public
+# License (version 2.0 or later).
+#
+# The full license is available in LICENSE.GPL.txt, distributed with
+# this software.
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+# ------------------------------------------------------------------
+
+from PyInstaller.utils.hooks import copy_metadata, collect_data_files
+
+# MetPy requires metadata, because it queries its version via
+# pkg_resources.get_distribution(__package__).version or, in newer
+# versions, importlib.metadata.version(__package__)
+datas = copy_metadata('metpy')
+
+# Collect data files
+datas += collect_data_files('metpy')