Write "event: message" to SSE response (#192)

* Write "event: message" to SSE response
* Rename McpJsonRpcEndpoint to McpEndpoint
* Remove unused McpServerConfig.Arguments property

src/ModelContextProtocol/Client/McpClient.cs

@@ -10,7 +10,7 @@ using System.Text.Json;
 namespace ModelContextProtocol.Client;
 
 /// <inheritdoc/>
-internal sealed class McpClient : McpJsonRpcEndpoint, IMcpClient
+internal sealed class McpClient : McpEndpoint, IMcpClient
 {
     private readonly IClientTransport _clientTransport;
     private readonly McpClientOptions _options;