chore: import upstream snapshot with attribution

dotnet/test/VectorData/SqliteVec.ConformanceTests/Support/SqliteFixture.cs

@@ -0,0 +1,10 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using VectorData.ConformanceTests.Support;
+
+namespace SqliteVec.ConformanceTests.Support;
+
+public class SqliteFixture : VectorStoreFixture
+{
+    public override TestStore TestStore => SqliteTestStore.Instance;
+}