Change to pyproject.toml

[thewhaleking]

When installing with pip install -e ., we get the warning:

DEPRECATION: Legacy editable install of bittensor==8.3.1 from file:///Users/bhimes/bittensor (setup.py develop) is deprecated. pip 25.0 will enforce this behaviour change. A possible replacement is to add a pyproject.toml or enable --use-pep517, and use setuptools >= 64. If the resulting installation is not behaving as expected, try using --config-settings editable_mode=compat. Please consult the setuptools documentation for more information. Discussion can be found at pypa/pip#11457