Introduce pyproject.toml build changes

[bpkroth]

This PR builds off of #762 and #763

These are in part

1. followup fixups for Cascading series of CI dependency problems #746 (e.g., to allow setuptools-scm to be pulled in at build time as a build dependency only when conda an pip have mismatched version issues), and
2. Modernization improvements to allow us to make better use of other tools (e.g., black that only accept pyproject.toml files as their configuration files).

To do so, we move some configs from setup.py to pyproject.toml for each module.
However, to retain the ability to rewrite URLs in published README.md files on PyPi as well as consistent version dependencies across modules without the need to manually specify version numbers (e.g., using setuptools-scm) we mark a few dependencies as dynamic and leave our existing logic inside the setup.py file.

Finally, we reorganize the version.py file to be inside the module and fix a few previous omissions for mlos_viz.

[bpkroth]

@motus I'm thinking we cut a new release after this and the OneShotOptimizer fixups are in.