[BUG]: Pydantic 1.9+ compatibility

[tazarov]

Closes #2503
Closes #2137

Description of changes

Summarize the changes made by this PR.

• Improvements & Bug fixes
  • Support for pydantic 1.x in FastAPI server.

Test plan

How are these changes tested?

• Tests pass locally with pytest for python, yarn test for js, cargo test for rust

Documentation Changes

N/A

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Reviewer Checklist

Please leverage this checklist to ensure your code review is thorough before approving

Testing, Bugs, Errors, Logs, Documentation

• Can you think of any use case in which the code does not behave as intended? Have they been tested?
• Can you think of any inputs or external events that could break the code? Is user input validated and safe? Have they been tested?
• If appropriate, are there adequate property based tests?
• If appropriate, are there adequate unit tests?
• Should any logging, debugging, tracing information be added or removed?
• Are error messages user-friendly?
• Have all documentation changes needed been made?
• Have all non-obvious changes been commented?

System Compatibility

• Are there any potential impacts on other parts of the system or backward compatibility?
• Does this change intersect with any items on our roadmap, and if so, is there a plan for fitting them together?

Quality

• Is this code of a unexpectedly high quality (Readability, Modularity, Intuitiveness)

[tazarov]

• [BUG]: Pydantic 1.9+ compatibility #2229 👈
• main

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[codetheweb]

maybe leave some comments on the helper methods indicating they're for backwards compatibility? otherwise lgtm!