Fix/streaming

[Iamsdt]

This pull request introduces improvements to streaming responses in the graph API by ensuring that streaming endpoints bypass GZip compression and are properly configured for event streaming. It also updates the streaming service to yield newline-delimited JSON strings for easier client consumption and simulates network delay in the mock weather service for more realistic behavior.

Streaming response improvements:

• Added SelectiveGZipMiddleware in setup_middleware.py to exclude streaming endpoints (e.g., /v1/graph/stream) from GZip compression, ensuring immediate data transmission without buffering. [1] [2]
• Updated the streaming endpoint in router.py to use media_type="text/event-stream", set headers to prevent unwanted transformations and buffering, and explicitly disabled content encoding to bypass GZip.

Streaming service changes:

• Changed the return type of stream_graph in graph_service.py to yield newline-delimited JSON strings instead of Content objects, making streaming output easier to parse on the client side. [1] [2] [3] [4]

Testing and simulation:

• Added a simulated network delay (sleep(1)) to the mock weather response in react.py for more realistic testing. [1] [2]