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/ReadResourceRequestParams.cs

@@ -0,0 +1,19 @@
+using System.Text.Json.Serialization;
+
+namespace ModelContextProtocol.Protocol;
+
+/// <summary>
+/// Represents the parameters used with a <see cref="RequestMethods.ResourcesRead"/> request from a client to get a resource provided by a server.
+/// </summary>
+/// <remarks>
+/// The server will respond with a <see cref="ReadResourceResult"/> containing the resulting resource data.
+/// See the <see href="https://github.com/modelcontextprotocol/specification/blob/main/schema/">schema</see> for details.
+/// </remarks>
+public class ReadResourceRequestParams : RequestParams
+{
+    /// <summary>
+    /// The URI of the resource to read. The URI can use any protocol; it is up to the server how to interpret it.
+    /// </summary>
+    [JsonPropertyName("uri")]
+    public required string Uri { get; init; }
+}