Prevent llms/mlx_lm from serving the local directory as a webserver (#498)

* Don't serve local directory

BaseHTTPRequestHandler serves the current directory by default. Definitely not intended behaviour. Remove the "do_HEAD" and "do_GET" methods.

* Fix typo in method name

I assume hanlde_stream was intended to be called handle_stream

* Fix outdated typehint

load_model returns nn.Module, however fetch_from_hub was not updated to reflect the change

* Add some more type hints

* Add warnings for using in prod

Add a warning to README and runtime, discouraging use in production. The warning is the same as on the python docs for HTTPServer https://docs.python.org/3/library/http.server.html

* format

* nits

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Co-authored-by: Awni Hannun <awni@apple.com>

ACKNOWLEDGMENTS.md

@@ -12,3 +12,4 @@ MLX Examples was developed with contributions from the following individuals:
 - Shunta Saito: Added support for PLaMo models.
 - Gabrijel Boduljak: Implemented `CLIP`.
 - Markus Enzweiler: Added the `cvae` examples.
+- Rasmus Kinnunen: Fixed a security hole in the `llms/mlx_lm` example