Expand typed firewall and map API

src/LibNftables/NftMap.cs

@@ -0,0 +1,49 @@
+namespace LibNftables;
+
+/// <summary>
+/// Represents a typed nftables map definition backed by native C# collections.
+/// </summary>
+public sealed class NftMap
+{
+    /// <summary>
+    /// Gets or sets the map name.
+    /// </summary>
+    public string? Name { get; set; }
+
+    /// <summary>
+    /// Gets or sets a common typed key type.
+    /// </summary>
+    /// <remarks>
+    /// Set either <see cref="KeyType"/> or <see cref="CustomKeyTypeExpression"/>.
+    /// </remarks>
+    public NftMapType? KeyType { get; set; }
+
+    /// <summary>
+    /// Gets or sets a custom nftables key-type expression for the map.
+    /// </summary>
+    /// <remarks>
+    /// Set either <see cref="KeyType"/> or <see cref="CustomKeyTypeExpression"/>.
+    /// </remarks>
+    public string? CustomKeyTypeExpression { get; set; }
+
+    /// <summary>
+    /// Gets or sets a common typed value type.
+    /// </summary>
+    /// <remarks>
+    /// Set either <see cref="ValueType"/> or <see cref="CustomValueTypeExpression"/>.
+    /// </remarks>
+    public NftMapType? ValueType { get; set; }
+
+    /// <summary>
+    /// Gets or sets a custom nftables value-type expression for the map.
+    /// </summary>
+    /// <remarks>
+    /// Set either <see cref="ValueType"/> or <see cref="CustomValueTypeExpression"/>.
+    /// </remarks>
+    public string? CustomValueTypeExpression { get; set; }
+
+    /// <summary>
+    /// Gets the entries declared inline with the map definition.
+    /// </summary>
+    public IList<NftMapEntry> Entries { get; } = new List<NftMapEntry>();
+}