[BETA] Add OpenAI /images/variations + Topaz API support (#7700)

* feat(main.py): initial commit for `/image/variations` endpoint support

* refactor(base_llm/): introduce new base llm base config for image variation endpoints

* refactor(openai/image_variations/transformation.py): implement openai image variation transformation handler

* fix: test

* feat(openai/): working openai `/image/variation` endpoint calls via sdk

* feat(topaz/): topaz sync image variation call support

Addresses https://github.com/BerriAI/litellm/issues/7593

'

* fix(topaz/transformation.py): fix linting errors

* fix(openai/image_variations/handler.py): fix passing json data

* fix(main.py): image_variation/

support async image variation route - `aimage_variation`

* fix(test_get_model_info.py): fix test

* fix: cleanup unused imports

* feat(openai/): add async `/image/variations` endpoint support

* feat(topaz/): support async `/image/variations` calls

* fix: test

* fix(utils.py): fix get_model_info_helper for no model info w/ provider config

handles situation where model info is not known but provider config exists

* test(test_router_fallbacks.py): mark flaky test

* fix: fix unused imports

* test: bump otel load test perf threshold - accounts for current load tests hitting same server

litellm/llms/topaz/common_utils.py

@@ -0,0 +1,37 @@
+from typing import List, Optional
+
+from litellm.secret_managers.main import get_secret_str
+from litellm.types.utils import ModelInfoBase
+
+from ..base_llm.base_utils import BaseLLMModelInfo
+from ..base_llm.chat.transformation import BaseLLMException
+
+
+class TopazException(BaseLLMException):
+    pass
+
+
+class TopazModelInfo(BaseLLMModelInfo):
+    def get_model_info(
+        self, model: str, existing_model_info: Optional[ModelInfoBase] = None
+    ) -> Optional[ModelInfoBase]:
+        return existing_model_info
+
+    def get_models(self) -> List[str]:
+        return [
+            "topaz/Standard V2",
+            "topaz/Low Resolution V2",
+            "topaz/CGI",
+            "topaz/High Resolution V2",
+            "topaz/Text Refine",
+        ]
+
+    @staticmethod
+    def get_api_key(api_key: Optional[str] = None) -> Optional[str]:
+        return api_key or get_secret_str("TOPAZ_API_KEY")
+
+    @staticmethod
+    def get_api_base(api_base: Optional[str] = None) -> Optional[str]:
+        return (
+            api_base or get_secret_str("TOPAZ_API_BASE") or "https://api.topazlabs.com"
+        )