* added memgpt server command
* added the option to specify a port (rest default 8283, ws default 8282)
* fixed import in test
* added agent saving on shutdown
* added basic locking mechanism (assumes only one server.py is running at the same time)
* remove 'STOP' from buffer when converting to list for the non-streaming POST resposne
* removed duplicate on_event (redundant to lifespan)
* added GET agents/memory route
* added GET agent config
* added GET server config
* added PUT route for modifying agent core memory
* refactored to put server loop in separate function called via main
