407d11a58a
This commit adds initial support for a maintaining a server-side session with attributes across HTTP requests. The WebSession abstraction can be accessed via WebServerExchange from a WebFilter or the target WebHandler. The session sub-package contains additional abstractions for creating and managing sessions providing a basis for extensibility (e.g. Spring Session). Those include WebSessionManager, SessionIdStrategy, and SessionStore along with a cookie-based session id strategy and an in-memory session store in use by default. Note that the current API does not provide a way to invalidate or re-create the session from server side code.