feat: long poll api endpoint and user manager #46
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-Added a user manager class. One instance of this class is created for every line. There is an event emitter which triggers every time a add/remove function is called on the user manager instance.
-Added a heartbeat endpoint that only resolves if there is a change to the list of users. I am thinking we can use this to implement a long polling from the client. The client will make one request that will linger until it received an updated user list. The client will then immediately make a new request.
-Updated unit tests