* Option to mount SSE server to existing ASGI server
Fixes#311
Add option to mount SSE server to an existing ASGI server.
* Add a new method `sse_app` in `src/mcp/server/fastmcp/server.py` to return an instance of the SSE server app.
* Update the `run_sse_async` method in `src/mcp/server/fastmcp/server.py` to use the new `sse_app` method.
* Update the documentation in `README.md` to include instructions on how to mount the SSE server to an existing ASGI server.
* Fix the example in `README.md` to use `app.mount('/', mcp.sse_app())` instead.
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For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/modelcontextprotocol/python-sdk/issues/311?shareId=XXXX-XXXX-XXXX-XXXX).
* Add `sse_app` method and update `run_sse_async` method in `server.py`
* Add `sse_app` method to return an instance of the SSE server app
* Update `run_sse_async` method to use the new `sse_app` method
Update `README.md` to include instructions for mounting SSE server
* Add section on mounting the SSE server to an existing ASGI server
* fix: Move import statements to the top of the file/
* docs: Update README to reflect changes in mounting SSE server with Starlette
* docs: Formatting of SSE server mounting example in README
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