Partially build component before giving it to the sim

[rusu24edward]

Whether using the SmartGridWorldSimulation or the GridWorldSimulation, it would be nice to be able to partially build a component and then give it to the simulation to finish building. For example, I would like to build a done component with a target_mapping already configured. Then I want to give that component to the sim to finish building (with the agents and grid, etc.).

target_overlap_done = TargetAgentOverlapDone(
    target_mapping={....}
)
target_encoding_done = TargetEncodingInactiveDone(
    target_mapping={...}
)
sim = MySim(
    ....,
    dones={target_overlap_done, target_encoding_done},

The building process in MySim doesn't have to configure the target_mapping parameter because that is already assigned, but it would give it the other necessary parameters, like agents and grid.