Auto-generated constants.py

[jarq6c]

This PR introduces auto-generated modules using Jinja2 templates. Dependencies are limited to the package's develop target.

Additions

• scripts/build_constants.py CLI tool to build the constants.py module.
• templates/constants.py.j2 Jinja2 template for constants.py

Changes

• Old manually created constants.py has been replaced by a generated module.

Testing

1. tests/test_constants.py
2. scripts/test_build_constants.py

Checklist

• PR has an informative and human-readable title
• PR is well outlined and documented. See #12 for an example
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows project standards (see CONTRIBUTING.md)
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output) using numpy docstring formatting
• Reviewers requested with the Reviewers tool ➡️

[christophertubbs]

I've got a few nitpicks but no real blockers. Good work on keeping the scope down.

[christophertubbs]

👍🏻