(Refactor) Code Quality improvement - Use Common base handler for clarifai/ (#7125)

* use base_llm_http_handler for clarifai

* fix clarifai completion

* handle faking streaming base llm http handler

* add fake streaming for clarifai

* add FakeStreamResponseIterator for base model iterator

* fix get_model_response_iterator

* fix base model iterator

* fix base model iterator

* add support for faking sync streams clarfiai

* add fake streaming for clarifai

* remove unused code

* fix import

* fix llm http handler

* test_async_completion_clarifai

* fix clarifai tests

* fix linting

litellm/llms/base_llm/base_model_iterator.py

@@ -0,0 +1,43 @@
+import json
+from abc import abstractmethod
+from typing import List, Optional, Tuple
+
+import litellm
+from litellm.litellm_core_utils.core_helpers import map_finish_reason
+from litellm.types.utils import (
+    ChatCompletionToolCallChunk,
+    ChatCompletionUsageBlock,
+    GenericStreamingChunk,
+    ModelResponse,
+)
+
+
+class FakeStreamResponseIterator:
+    def __init__(self, model_response, json_mode: Optional[bool] = False):
+        self.model_response = model_response
+        self.json_mode = json_mode
+        self.is_done = False
+
+    # Sync iterator
+    def __iter__(self):
+        return self
+
+    @abstractmethod
+    def chunk_parser(self, chunk: dict) -> GenericStreamingChunk:
+        pass
+
+    def __next__(self):
+        if self.is_done:
+            raise StopIteration
+        self.is_done = True
+        return self.chunk_parser(self.model_response)
+
+    # Async iterator
+    def __aiter__(self):
+        return self
+
+    async def __anext__(self):
+        if self.is_done:
+            raise StopAsyncIteration
+        self.is_done = True
+        return self.chunk_parser(self.model_response)