_generate_args
=========================================

.. py:function:: petpal.cli.cli_tac_fitting._generate_args() -> argparse.Namespace

   Generates and handles the arguments for the command-line interface.

   This function sets up the argument parser, adds required and optional arguments, and parses input arguments.

   :returns: *argparse.Namespace* -- Parsed command-line arguments.

   :raises argparse.ArgumentError: If necessary arguments are missing or invalid arguments are provided.