enabled langgraph test client use json dump

[gyliu513]

Description

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @gyliu513, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the developer experience when using the langgraph test client. It modifies the client's output to present responses in a more structured and human-readable JSON format, making it significantly easier to debug and understand the data flow from the client's interactions.

Highlights

• Improved Output Readability: Enhanced the readability of model_dump output in test_client.py by pretty-printing it using json.dumps with an indent of 2, making the JSON responses much easier to inspect.
• Enhanced Test Client Clarity: Added descriptive headers and footers (e.g., '=== Send Message Response ===', '=== Multi-turn First Response ===') around the printed JSON responses for various client operations, including send_message, multi-turn interactions, and streaming responses. This clearly delineates different outputs.
• Streaming Response Tracking: Introduced a chunk counter for streaming responses, printing '--- Chunk X ---' before each streamed JSON chunk, which helps in tracking the progress and individual parts of a streaming interaction.

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[gemini-code-assist]

Code Review

This pull request improves the readability of the test client's output by pretty-printing the JSON responses. The changes are clear and achieve the stated goal. I've added one comment suggesting a refactoring to reduce code duplication, which would improve the maintainability of the script. Overall, this is a good improvement.

[gemini-code-assist]

The code block for printing the response is repeated multiple times in this file (e.g., lines 153-155 and 176-178).

To improve maintainability and follow the DRY (Don't Repeat Yourself) principle, consider extracting this logic into a helper function.