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/SetLevelRequestParams.cs

@@ -0,0 +1,20 @@
+using System.Text.Json.Serialization;
+
+namespace ModelContextProtocol.Protocol;
+
+/// <summary>
+/// Represents the parameters used with a <see cref="RequestMethods.LoggingSetLevel"/> request from a client
+/// to enable or adjust logging.
+/// </summary>
+/// <remarks>
+/// This request allows clients to configure the level of logging information they want to receive from the server.
+/// The server will send notifications for log events at the specified level and all higher (more severe) levels.
+/// </remarks>
+public class SetLevelRequestParams : RequestParams
+{
+    /// <summary>
+    /// Gets or sets the level of logging that the client wants to receive from the server. 
+    /// </summary>
+    [JsonPropertyName("level")]
+    public required LoggingLevel Level { get; init; }
+}