Improve ergonomics of temporal subset simulation

To help make Temporal Subset Simulation more useful, we would like to provide values from a previously run simulation to the mission model at initialization time.

We provide this query through the API:
https://nasa-ammos.github.io/aerie-docs/api/examples/simulation/#query-for-simulation-resource-data-at-a-given-time

The best way to leverage that query would be to write an external script against the API that queries the above function and populates the simulation arguments.

However, it is cumbersome to leave the Aerie context and run an external script. This ticket is to prototype an approach that would allow users to place "checkpoints" from which simulation can be restarted efficiently.

Temporal subset limitations apply - restarting in-progress activities is a non-goal.