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/RequestMethods.cs

@@ -0,0 +1,105 @@
+namespace ModelContextProtocol.Protocol;
+
+/// <summary>
+/// Provides constants with the names of common request methods used in the MCP protocol.
+/// </summary>
+public static class RequestMethods
+{
+    /// <summary>
+    /// The name of the request method sent from the client to request a list of the server's tools.
+    /// </summary>
+    public const string ToolsList = "tools/list";
+
+    /// <summary>
+    /// The name of the request method sent from the client to request that the server invoke a specific tool.
+    /// </summary>
+    public const string ToolsCall = "tools/call";
+
+    /// <summary>
+    /// The name of the request method sent from the client to request a list of the server's prompts.
+    /// </summary>
+    public const string PromptsList = "prompts/list";
+
+    /// <summary>
+    /// The name of the request method sent by the client to get a prompt provided by the server.
+    /// </summary>
+    public const string PromptsGet = "prompts/get";
+
+    /// <summary>
+    /// The name of the request method sent from the client to request a list of the server's resources.
+    /// </summary>
+    public const string ResourcesList = "resources/list";
+
+    /// <summary>
+    /// The name of the request method sent from the client to read a specific server resource.
+    /// </summary>
+    public const string ResourcesRead = "resources/read";
+
+    /// <summary>
+    /// The name of the request method sent from the client to request a list of the server's resource templates.
+    /// </summary>
+    public const string ResourcesTemplatesList = "resources/templates/list";
+
+    /// <summary>
+    /// The name of the request method sent from the client to request <see cref="NotificationMethods.ResourceUpdatedNotification"/> 
+    /// notifications from the server whenever a particular resource changes.
+    /// </summary>
+    public const string ResourcesSubscribe = "resources/subscribe";
+
+    /// <summary>
+    /// The name of the request method sent from the client to request unsubscribing from <see cref="NotificationMethods.ResourceUpdatedNotification"/> 
+    /// notifications from the server.
+    /// </summary>
+    public const string ResourcesUnsubscribe = "resources/unsubscribe";
+
+    /// <summary>
+    /// The name of the request method sent from the server to request a list of the client's roots.
+    /// </summary>
+    public const string RootsList = "roots/list";
+
+    /// <summary>
+    /// The name of the request method sent by either endpoint to check that the connected endpoint is still alive.
+    /// </summary>
+    public const string Ping = "ping";
+
+    /// <summary>
+    /// The name of the request method sent from the client to the server to adjust the logging level.
+    /// </summary>
+    /// <remarks>
+    /// This request allows clients to control which log messages they receive from the server
+    /// by setting a minimum severity threshold. After processing this request, the server will
+    /// send log messages with severity at or above the specified level to the client as
+    /// <see cref="NotificationMethods.LoggingMessageNotification"/> notifications.
+    /// </remarks>
+    public const string LoggingSetLevel = "logging/setLevel";
+
+    /// <summary>
+    /// The name of the request method sent from the client to the server to ask for completion suggestions.
+    /// </summary>
+    /// <remarks>
+    /// This is used to provide autocompletion-like functionality for arguments in a resource reference or a prompt template.
+    /// The client provides a reference (resource or prompt), argument name, and partial value, and the server 
+    /// responds with matching completion options.
+    /// </remarks>
+    public const string CompletionComplete = "completion/complete";
+
+    /// <summary>
+    /// The name of the request method sent from the server to sample an large language model (LLM) via the client.
+    /// </summary>
+    /// <remarks>
+    /// This request allows servers to utilize an LLM available on the client side to generate text or image responses
+    /// based on provided messages. It is part of the sampling capability in the Model Context Protocol and enables servers to access
+    /// client-side AI models without needing direct API access to those models.
+    /// </remarks>
+    public const string SamplingCreateMessage = "sampling/createMessage";
+
+    /// <summary>
+    /// The name of the request method sent from the client to the server when it first connects, asking it initialize.
+    /// </summary>
+    /// <remarks>
+    /// The initialize request is the first request sent by the client to the server. It provides client information
+    /// and capabilities to the server during connection establishment. The server responds with its own capabilities
+    /// and information, establishing the protocol version and available features for the session.
+    /// </remarks>
+    public const string Initialize = "initialize";
+}