Add --include-docstrings to generate_stubs.py

This feature was added to stubgen in 2023 and would improve developer experience with depthai.

Bellow is quote from the original issue (on stubgen repo):

I think this would be most useful for external C or C++ modules, because some IDEs don't look for signatures or docstrings in compiled modules.
Using stubgen at least fixes autocomplete for compiled modules, but if the stub files don't include docstrings, IDEs might not show any documentation when hovering over the function/class/variable in the editor (unlike with plain Python modules).

For example, Pylance in VSCode doesn't show documentation for functions in compiled modules, even with stub files generated by stubgen.

Author: filipproch

generate_stubs.py

@@ -29,7 +29,7 @@
         print(f'Could not import depthai: {ex}')
 
     print(f'PYTHONPATH set to {env["PYTHONPATH"]}')
-    subprocess.check_call(['stubgen', '-p', MODULE_NAME, '-o', f'{DIRECTORY}'], cwd=DIRECTORY, env=env)
+    subprocess.check_call(['stubgen', '--include-docstrings', '-p', MODULE_NAME, '-o', f'{DIRECTORY}'], cwd=DIRECTORY, env=env)
 
     # Add py.typed
     open(f'{DIRECTORY}/depthai/py.typed', 'a').close()