Switch build-backend from setuptools to hatchling

[BrianJKoopman]

Description

This PR switches the build system backend from setuptools to hatchling. It follows the same steps taken in ocs.

The same versioning side-effect applies. Versions on installs from source will be slightly different now:

old version format: 0.5.0+14.gc4b73f75
new version format: 0.5.0.post1.dev14+gc4b73f75

I also added and organized some of the dependencies across the pyproject.toml and requirements.txt files.

Motivation and Context

See simonsobs/ocs#403.

How Has This Been Tested?

I have built the package and inspected the resulting sdist. I also ran tests against an installation from the built wheel. This required manual installation of the dependencies not available on PyPI, but after that tests ran mostly fine. I did experience a hanging test related to an SNMP agent, but I was unable to reproduce. We'll see how the tests in the CI go.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Packaging change

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.