Update content according to latest spec (#513)

* Update content according to latest spec

* Add Title to a bunch of types

* Add _meta to lots of types

* Address feedback, more cleanup, fix NAOT test failure

src/ModelContextProtocol.Core/Protocol/ReadResourceRequestParams.cs

@@ -9,7 +9,7 @@ namespace ModelContextProtocol.Protocol;
 /// 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
+public sealed 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.