Use path libs for constructing paths

[datadavev]

hashstore/src/hashstore/client.py

Line 750 in 294b4fe

hashstore_py_log = store_path + "/python_client.log"

Scattered throughout the code is a mix of format strings, string concatenation, and pathlib mechanisms used for constructing file path. Suggest just using pathlib or at least using os.path.join() for constructing paths.

[doulikecookiedough]

This has been completed via Feature-139: Path Construction & Clean Up

Note - Accidentally replied to wrong ticket.