server : add Anthropic Messages API support (#17570)

* server : add Anthropic Messages API support

* remove -@pytest.mark.slow from tool calling/jinja tests

* server : remove unused code and slow/skip on test_anthropic_vision_base64_with_multimodal_model in test_anthropic_api.py

* server : removed redundant n field logic in anthropic_params_from_json

* server : use single error object instead of error_array in streaming response handler for /v1/chat/completions and use unordered_set instead of set in to_json_anthropic_stream()

* server : refactor Anthropic API to use OAI conversion

* make sure basic test always go first

* clean up

* clean up api key check, add test

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Co-authored-by: Xuan Son Nguyen <son@huggingface.co>

tools/server/tests/conftest.py

@@ -13,3 +13,9 @@ def stop_server_after_each_test():
     )  # copy the set to prevent 'Set changed size during iteration'
     for server in instances:
         server.stop()
+
+
+@pytest.fixture(scope="module", autouse=True)
+def do_something():
+    # this will be run once per test session, before any tests
+    ServerPreset.load_all()