Ace/value error handling

[TheDuyIT]

Overview:

Add ValueError handling
Propagate 400 error code when python generator raise ValueError

Details:

Python async generator might perform some validations and raises exception such as ValueError. Dynamo receives the exception and response 500 error.
This PR add logic to catch ValueError from python generator and propagate 400 error to the response.

Logic for grpc hasn't been implemented yet.

Where should the reviewer start?

lib/bindings/python/rust/engine.rs:

• lines: 131-133 Add ValueError into ResponseProcessingError
• lines: 257-265: assign code 400 if exception is ValueError

lib/llm/src/http/service/openai.rs: error code propagation

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• closes GitHub issue: #xxx

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👋 Hi TheDuyIT! Thank you for contributing to ai-dynamo/dynamo.

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