io_utils documentation
* add docstring to read_local function and handle file read errors gracefully by returning None on failure
* update read_local function to support .xlsx files and improve error handling
* add docstring to read_s3 function to clarify its purpose and return value
* refactor read_s3 and read_s3_csv functions to improve error handling and add type hints
* improve error handling in read_s3_csv function for CSV file parsing
* enhance read_input function with error handling and detailed docstring
* Add TODOs for read_input_csv and filter_already_processed functions; add type hints and docstring for remove_txt_extension
* enhance write_local function documentation; make docstrings more consistent when there is a "notes" section
* enhance write_local and write_s3 functions; improve documentation, add error output type handling, and ensure consistent CSV writing options
* refactor test_io_utils.py; reorganize imports and enhance read_input_local test with additional mock for file existence
Approved-by: Katon Minhas
Alex Galarce
0562b90646