Enhancement: Add Python 3.12 and 3.13

[adamkells]

Description

This PR adds functionality for python 3.12

Address #127

This is achieved by removing Spyne as a dependency for SOAP servers.

In particular, we add a FastAPI server and a WSDL file while removing spyne and associated files.

Changes Made

Python 3.12 is added as an acceptable python version. The ci/cd will now additionally run on 3.12 as a test version. The publishing of the package will also be done on 3.12

Testing

Vibe coded tests were run, existing tests were modified to run on new code.

Additionally the Cookbook example for connecting to Medplum was confirmed to run and give the same output before and after.

Checklist

• I have read the contributing guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[jenniferjiangkells]

The approach looks sound to me. The most important thing is that it's backward compatible with the cookbook examples and sets up a solid foundation for future improvements, and this ticks the box.

I've made some general comments, but tbh the only change absolutely needed is removing spyne as a dependency in the pyproject.toml.