e REINFORCEjs DQN in your application, define an `env` object that has the following methods:

- `env.getNumStates()` returns an integer for the dimensionality of the state feature space
- `env.getMaxNumActions()` returns an integer with the number of actions the agent can use

This seems kind of silly and the name `getNumStates` is a bit of a misnomer because it refers to the size of the state feature vector, not the raw number of unique states, but I chose this interface so that it is consistent with the 