Add Support for Python 3.12

[plypaul]

Resolves #1065

Description

This adds support for Python 3.12. Once this is merged, the plan is to:

• Increment the version of MF and publish it.
• Update dbt-metricflow to use that new version since CI depends on that package.
• Update CI to add tests for Python 3.12.

[tlento]

Huzzah!

Note - we're still in this awkward place where I personally have to generate the attribution. Let me know if you want me to deal with the MetricFlow release. I can also just generate that update and add it to your release PR.

[plypaul]

Sure, that would be helpful. Let me verify things with a dev release first.