Smart AgentBasedSimulation

[rusu24edward]

The environments we design are completely based what we include in the init, namely which components to use. We should make a smart super class that can fill out the rest of the functions, like reset, step, get_obs, etc. based on what we create in the init and some order that we specify for step.

Furthermore, we shouldn't have to make a separate simulation just because a different component is used. So we should think of ways to support varying the components without the user having to redefine the simulation.

Depends on #58

[rusu24edward]

For built-in components, we can create a component registry in the GWSF that maps a component's name to itself. Then we can support a builder that takes component names as input and builds out the simulation from there. A rough idea of the code might look something like this:

class GridWorldSimulation(ABS):
    ...
    @class_method
    def build_from_built_in_components(self, states=None, actors=None, observers=None, dones=None, **kwargs):
        if states is not None:
            assert type(states) is set
            for state in states:
                assert type(state) is str
                assert state in GridWorldSimluation.component_registry
                assert issubclass(GridWorldSimluation.component_registry[state], StateBaseComponent)
            self.states = {
                state: GridWorldSimulation.component_registry[state](**kwargs)
                for state in states
            }

        if actors is not None:
            assert type(actors) is set
            for actor in actors:
                assert type(actor) is str
                assert actor in GridWorldSimluation.component_registry
                assert issubclass(GridWorldSimluation.component_registry[actor], ActorBaseComponent)
            self.actors = {
                actor: GridWorldSimulation.component_registry[actor](**kwargs)
                for actor in actors
            }
        ...

Then the user can just supply component names instead of having to redefine a new simulation entirely.

Outstanding questions:

1. Users can create their own components, can they add them to the GWSF registry? --> Users can register their components
2. Component wrappers? --> Smart GridWorld Sim takes component wrappers #420