Update SDK with new Annotation Types, Message Reasoning, & Message Chunks

[michaelbishoff]

Pull Request Summary

Description

New Annotation Types:

• Boolean
• File
• RankedChoices (ranking without ties)
• RankedGroups (ranking with ties)
• WorkspaceContainer (virtual environment upload)

Message Reasoning:

Any "reasoning" or "thinking" content provided by the model.

Message Chunks:

A new entity to represent a subset of Message Content. A chunk is a piece of content that exists within the message content. chunks are used to identify specific pieces of content which should have its own annotations. For example, an essay could be broken up into chunks where each chunk is a paragraph with their own annotations.

How did you test your code?

Which of the following have you done to test your changes? Please describe the tests that you ran to verify your changes.

• Created new unit tests in tests/ for the newly implemented methods
• Updated existing unit tests in tests/ to cover changes made to existing methods

Checklist

Please make sure all items in this checklist have been fulfilled before sending your PR out for review!

• I have commented my code in details, particularly in hard-to-understand areas
• I have updated Readme.rst document with examples for newly implemented public methods
• I have reviewed Deployment and Publishing Guide for Python SDK document
• I incremented the SDK version in _version.py (unless this PR only updates the documentation).
• In order to release a new version, a "Release Summary" needs to be prepared and published after the merge