Adding tests

# Feature
## Desired Behavior / Functionality
Right now our tests are very minimalist, we should aim to improve that.

## What Needs to Be Done
- [x] Track test coverage (e.g. similar to here: https://github.com/esa/torchquad/issues/124 )
- [x] Add test to run paseos with some actors over multiple time steps
- [ ] Add tests for dynamics part, check positions over a bit longer time period (e.g. half, full orbit)
- [ ] Have a test to check that calls to user API functions throw errors on faulty inputs (e.g. trying to create an actor with a 4D position, or negative charging rate, etc.)
- [ ] Add a test to see if running an activity from a notebook works as expected (not sure how to run a notebook from a test?)
- [ ] Add a test to see if you can successfully pip install and import the module
- [ ] Add a test where local actor is ground station

## How Can It Be Tested
With above tests :)