Add basis for conformance-based tests

[zastrowm]

Description

Add code infrastructure to be able to run a set of tests against all providers.

I needed to run some code against all providers and rather than continuing to copy/paste it locally, set us up for running a test or set of tests against all providers. The only test added so far is one that validates that models can be constructed but it sets us up for success later.

Related Issues

#313.

Documentation PR

N/A

Type of Change

New feature

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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