Bedrock usage metadata

For non streaming responses, Bedrock usage metadata was not being captured. Updated the metadata `dict` in line with how it was being handled for streaming responses.

src/ell/providers/bedrock.py

@@ -147,15 +147,9 @@ def translate_from_provider(
                     logger(tracked_results[0].text)
 
 
-                # usage = call_result.response.usage.dict() if call_result.response.get('usage') else {}
-                # metadata = call_result.response.model_dump()
-                # del metadata["content"]
-
-            # process metadata for ell
-            # XXX: Unify an ell metadata format for ell studio.
-            usage["prompt_tokens"] = usage.get("inputTokens", 0)
-            usage["completion_tokens"] = usage.get("outputTokens", 0)
-            usage["total_tokens"] = usage['prompt_tokens'] + usage['completion_tokens']
+                usage["prompt_tokens"] = provider_response.get('usage').get("inputTokens", 0)
+                usage["completion_tokens"] = provider_response.get('usage').get("outputTokens", 0)
+                usage["total_tokens"] = usage['prompt_tokens'] + usage['completion_tokens']
 
             metadata["usage"] = usage
             return tracked_results, metadata
@@ -228,4 +222,4 @@ def message_to_bedrock_message_format(message: Message) -> Dict[str, Any]:
             content_block_to_bedrock_format(c) for c in message.content
         ]))
     }
-    return converse_message
+    return converse_message