Remove species_table.py module

[louisfh]

Closes #292 by using importlib.resources to import species_table.csv, instead of having the species_table.py python module. This requires the resources folder to be
a sub-package.

[sammlapp]

Noting that importlib.resources will require Python >=3.7

[sammlapp]

Nice, seems to be a very simple change. I'm a bit wary of the path structure being system/os/package setup dependent. Could you test that it works properly in these scenarios?

• poetry install
• pip install local package path, ie pip install ~/my_opso/opensoundscape

Can probably just run pytest after installing to check if working

[louisfh]

This works on a fresh environment on Ubuntu 20.04.

I couldn't get this branch, develop or master to build and correctly run pytest using poetry installor pip install path on a Windows 10 machine.
EDIT: Oops - not surprising. I realize OpSo does not support Windows, except in using WSL.