Adjust to use pyproject.toml builder

[CodyCBakerPhD]

For a while now, the 'state-of-the-art' builder for Python packaging has been the pyproject.toml approach

@garrettmflynn I say we give it a try if you're up for it: https://packaging.python.org/en/latest/tutorials/packaging-projects/

(I'm also happy to handle this if you prefer)

HDMF-Zarr has used this recently: https://github.com/hdmf-dev/hdmf-zarr/blob/dev/pyproject.toml

Though I think we'd still stick to setuptools and not use tox

Ultimately we'd also have an adjusted auto-release workflow too

[garrettmflynn]

Sounds good. Was curious about this when I started configuring, I'll get a pyproject.toml going