List tools from DI once (#115)

* List tools from DI once

- Follow best practice to not mutate options outside of IConfigureOptions
- Long-term, we should move the repeated work from SetToolsHandler into
  an IPostConfigureOptions service or IMcpServerConnectionFactory

* Add Can_Create_Multiple_Servers_From_Options_And_List_Registered_Tools

* Flip stdin and stdout in StreamClientTransport

* s/McpToolType/McpServerToolType

* Clarify stdin and stdout refers to server process in StreamClientTransport

* fixup

src/ModelContextProtocol/Shared/McpJsonRpcEndpoint.cs

@@ -359,7 +359,7 @@ internal abstract class McpJsonRpcEndpoint : IAsyncDisposable
     /// Cleans up the endpoint and releases resources.
     /// </summary>
     /// <returns></returns>
-    protected async Task CleanupAsync()
+    protected virtual async Task CleanupAsync()
     {
         if (_isDisposed)
             return;