chore: import upstream snapshot with attribution

dotnet/test/VectorData/PgVector.UnitTests/PostgresHotel.cs

@@ -0,0 +1,51 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using Microsoft.Extensions.VectorData;
+
+namespace SemanticKernel.Connectors.PgVector.UnitTests;
+
+#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+
+/// <summary>
+/// A test model for the postgres vector store.
+/// </summary>
+public record PostgresHotel<T>()
+{
+    /// <summary>The key of the record.</summary>
+    [VectorStoreKey]
+    public T HotelId { get; init; }
+
+    /// <summary>A string metadata field.</summary>
+    [VectorStoreData()]
+    public string? HotelName { get; set; }
+
+    /// <summary>An int metadata field.</summary>
+    [VectorStoreData()]
+    public int HotelCode { get; set; }
+
+    /// <summary>A  float metadata field.</summary>
+    [VectorStoreData()]
+    public float? HotelRating { get; set; }
+
+    /// <summary>A bool metadata field.</summary>
+    [VectorStoreData(StorageName = "parking_is_included")]
+    public bool ParkingIncluded { get; set; }
+
+    [VectorStoreData]
+    public List<string> Tags { get; set; } = [];
+
+    /// <summary>A data field.</summary>
+    [VectorStoreData]
+    public string Description { get; set; }
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    public DateTimeOffset UpdatedAt { get; set; } = DateTimeOffset.UtcNow;
+
+    /// <summary>A vector field.</summary>
+    [VectorStoreVector(4, DistanceFunction = IndexKind.Hnsw, IndexKind = DistanceFunction.ManhattanDistance)]
+    public ReadOnlyMemory<float>? DescriptionEmbedding { get; set; }
+}
+#pragma warning restore CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.