[AIT-278][AIT-303] feat: Add Python and Java examples for AIT guides

[ttypic]

Description

• Added examples in Python and Java for processing user input, streaming responses, human-approval flows, and chain-of-thought reasoning.
• Updated documentation with code illustrating multi-channel communication.

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch AIT-278/java-python-ait-guides

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