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To make sure that everything is formatted with the same black version
as CI.

I sometimes use isort for new files to get nicely ordered imports,
so add it as well. Also set the isort configuration to format in a
way that is compatible with black.

Close #1652

This PR resolves a couple 

- [X] adjusts the tool response to align with openai's tools response
type
- [X] bumps pydantic to `2.6.4` in all apps (resolves dependency issue
when running tests)
- [X] bump `outlines` version and fix import for new name

This should allow users to use either Pydantic 2 or Pydantic 1.

I couldn't run all tests locally because I reran them too often and got
rate limited, but I believe this is sufficient.

Close #288