Setup tox

[emmyoop]

resolves #

This is a:

• [ ] documentation update
• [ ] bug fix with no breaking changes
• [x] new functionality
• [ ] a breaking change

All pull requests from community contributors should target the main branch (default).

Description & motivation

This is related to https://github.com/dbt-labs/dbt-utils/pull/919.

I am setting up tox with the package to begin to support testing with versionless in cloud.

Checklist

• [ ] This code is associated with an issue which has been triaged and accepted for development.
• [ ] I have verified that these changes work locally
• [ ] I have updated the README.md (if applicable)
• [ ] I have added tests & descriptions to my models (and macros if applicable)
• [ ] I have added an entry to CHANGELOG.md

[emmyoop]

I'm going to need someone more familiar with the package and how testing works to help work out the testing errors.

[github-actions[bot]]

This PR has been marked as Stale because it has been open with no activity as of late. If you would like the PR to remain open, please comment on the PR or else it will be closed in 7 days.

[github-actions[bot]]

Although we are closing this PR as stale, it can still be reopened to continue development. Just add a comment to notify the maintainers.