hooks: add hook for lightning

Add hook for (PyTorch) `lightning`. Currently, the main functionality
is to ensure that the `version.info` file from the package is
collected.

We do not collect source .py files, as it seems that even if
`lightning.LightningModule.to_torchscript()` is used, it requires
the source where the model inheriting from `lightning.LightningModule`
is defined, rather than `lightning`'s own sources. We can always
add source .py files collection later, if it proves to be necessary.

news/676.new.7.rst

@@ -0,0 +1,2 @@
+Add hook for ``lightning`` (PyTorch Lightning) to ensure that its
+``version.info`` data file is collected.

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

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+# ------------------------------------------------------------------
+# Copyright (c) 2023 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 collect_data_files
+
+# Collect version.info (which is read during package import at run-time). Avoid collecting data from `lightning.app`,
+# which likely does not work with PyInstaller without additional tricks (if we need to collect that data, it should
+# be done in separate `lightning.app` hook).
+datas = collect_data_files(
+    'lightning',
+    includes=['version.info'],
+)