* Add AspNetCoreSseMcpTransport sample
* Fix build errors after rebase
* React to McpServerFactory changes
* Make Utf8JsonWriter non thread static
* Fix test errors caused by not rebasing the HttpLister changes on factory overhaul commit
Handlers are now specified before connecting the client/server. Otherwise, race conditions exist. Handlers move into being a part of the McpClientOptions/McpServerOptions, so that they're provided to the factories. Where relevant, the handlers are specified as part of the capability descriptors, so that they go hand in hand.
The factories are no longer stateful. Instead of allocating a factory and then calling a create method on it, you just call a static factory method.
* Server support (stdio)
* TestServer project
* Refactored McpClient class to extract shared endpoint logic (with McpServer) to a base class, McpJsonRpcEndpoint.
* Improved xmldoc comments for protocol types, mirroring specification schema comments.
* Update README.MD
