Add streaming support to Amazon provider and implement generate_stream_text method

simplemind/providers/amazon.py

@@ -92,3 +92,24 @@ class Amazon(BaseProvider):
         )
 
         return response.content[0].text
+
+    def generate_stream_text(self, prompt, *, llm_model, **kwargs):
+        """Generate streaming text using the Amazon API."""
+
+        # Prepare the messages.
+        messages = [
+            {"role": "user", "content": prompt},
+        ]
+
+        # Send the request to the API.
+        response = self.client.messages.create(
+            model=llm_model or self.DEFAULT_MODEL,
+            messages=messages,
+            stream=True,
+            **kwargs,
+        )
+
+        # Yield the text chunks.
+        for chunk in response:
+            if chunk.text:
+                yield chunk.text