Refactor SSE callback to handle async operations

[alexanderkasten]

This pull request includes changes to enhance the Server-Sent Events (SSE) handler in src/server/sse-server.ts. The updates focus on improving the flexibility and functionality of the SSE callback and adding guidance for handling long-running operations.

Enhancements to SSE handler:

• src/server/sse-server.ts: Updated the SSECallback type to allow the callback to return a promise that resolves to a cleanup function or a function that returns a promise.
• src/server/sse-server.ts: Added a hint in the documentation to avoid awaiting long-running operations directly in the callback to prevent blocking the initial response.
• src/server/sse-server.ts: Modified the start method in createSSEHandler to be asynchronous, allowing for better handling of asynchronous operations within the callback.
• src/server/sse-server.ts: Updated the invocation of the callback in createSSEHandler to await its result, ensuring proper handling of asynchronous callbacks.

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Name	Status	Preview	Comments	Updated (UTC)
v0-next-sse-r1gecphzhel	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 29, 2024 1:38pm