pytao installation with `pip` does not include required dependencies

[ken-lauer]

pytao primarily targets conda users and expects to be installed alongside conda-forge dependencies (especially the underlying bmad library, which is not available on PyPI).

Some users may still prefer to install with pip and use their development/pre-built bmad.

In order to do so, they would currently have to add the missing dependencies themselves:

pip install pytao pexpect h5py matplotlib "pydantic>=2"

It's worth considering moving these dependencies from environment.yml to pyproject.toml, then:

1. pip install pytao becomes useful, even though it won't have bmad
2. conda install -c conda-forge pytao will still work, as the dependencies are specified in the conda-forge recipe
3. mamba env create -n pytao --file environment.yml can install bmad from conda-forge and the remainder of the dependencies from PyPI.
   • Mixing dependencies from conda/PyPI is generally not recommended, but I don't really see a way around it. (I'm open to suggestions!)

[DavidSagan]

Having pytao usable for non-conda people is definitely important.