PR Summary

The pull request introduces serialization capabilities and new methods for enhanced testing and debugging across various components.

• engine/baml-lib/jinja/src/lib.rs: Added Serialize trait to RenderedPrompt and RenderContext_Client, updated render_prompt function for type safety, and included new unit tests.
• engine/baml-runtime/src/internal/llm_client/mod.rs: Added Serialize trait to multiple structs and enums for better data handling.
• engine/language_client_codegen/src/python/templates/async_client.py.j2: Introduced z_unstable_runtime and z_unstable_ctx_manager methods in BamlAsyncClient for internal access.
• engine/language_client_python/src/types/function_results.rs: Added internals method to FunctionResult for JSON serialization of internal LLM responses.
• engine/language_client_python/src/types/type_builder.rs: Enhanced type-building capabilities with new methods and imports from pyo3.

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PR Summary

(updates since last review)

The pull request introduces a macro for reducing redundancy in Python client struct implementations and adds an unstable async client template.

• engine/language-client-codegen/src/python/mod.rs: Introduced a macro to streamline From and TryFrom trait implementations for Python clients.
• engine/language-client-codegen/src/python/templates/unstable_async_client.py.j2: Added UnstableBamlAsyncClient class for handling asynchronous BAML operations.
• engine/language-client_python/python_src/baml_py/baml_py.pyi: Removed List import from the typing module; ensure no dependencies are affected.

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