Add Quantized Ops to the JIT (#1204)

* JIT for quantized ops

* remove unused imports

* address comments

* fix imports

* second attempt to fix imports

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Co-authored-by: Alex Barron <abarron22@apple.com>

mlx/backend/metal/jit/includes.h

@@ -18,6 +18,7 @@ const char* binary();
 const char* binary_two();
 const char* copy();
 const char* fft();
+const char* quantized();
 const char* ternary();
 const char* scan();
 const char* softmax();