[Feature Request] Add JSON Tree View for gRPC Responses

[rajeshkarnena]

Inspecting large and deeply nested JSON responses in the current plain-text format is challenging. It would greatly improve the user experience if grpcui could render gRPC responses in a collapsible JSON tree view, similar to tools like jsoneditoronline.org.

This would help users:

• Easily navigate and explore large JSON responses.
• Quickly identify key fields and values without scrolling through raw text.
• Potentially enable JSONPath-style querying in the future for advanced filtering and validation.

Suggested Implementation Ideas:

• Add a toggle to switch between raw JSON and tree view.
• Use an existing lightweight JSON tree viewer (e.g., jsoneditor or similar).
• Optionally allow searching or filtering within the JSON tree.

This feature would make grpcui more user-friendly for developers debugging complex gRPC services. Please let me know your thoughts on this.