Clean up namespaces (#410)

No meaningful code changes, just lots of namespace shuffling to have fewer namespaces and to put things in better namespaces.

src/ModelContextProtocol/Protocol/BlobResourceContents.cs

@@ -0,0 +1,30 @@
+using System.Text.Json.Serialization;
+
+namespace ModelContextProtocol.Protocol;
+
+/// <summary>
+/// Represents the binary contents of a resource in the Model Context Protocol.
+/// </summary>
+/// <remarks>
+/// <para>
+/// <see cref="BlobResourceContents"/> is used when binary data needs to be exchanged through
+/// the Model Context Protocol. The binary data is represented as a base64-encoded string
+/// in the <see cref="Blob"/> property.
+/// </para>
+/// <para>
+/// This class inherits from <see cref="ResourceContents"/>, which also has a sibling implementation
+/// <see cref="TextResourceContents"/> for text-based resources. When working with resources, the
+/// appropriate type is chosen based on the nature of the content.
+/// </para>
+/// <para>
+/// See the <see href="https://github.com/modelcontextprotocol/specification/blob/main/schema/">schema</see> for more details.
+/// </para>
+/// </remarks>
+public class BlobResourceContents : ResourceContents
+{
+    /// <summary>
+    /// Gets or sets the base64-encoded string representing the binary data of the item.
+    /// </summary>
+    [JsonPropertyName("blob")]
+    public string Blob { get; set; } = string.Empty;
+}