Add torpedo map object to sim

[Rain1618]

Goal: add support in the Unity sim for the torpedo task. Specifically, create an object that looks like the picture below and that has "holes" in the appropriate places such that the torpedo can be fired through it.

1. Get familiar with how to create objects in Unity (make a lil sideproject and follow some youtube tutorials or smth)
2. Get familiar with the torpedo task. Look at https://robonation.org/app/uploads/sites/4/2024/07/2024-RoboSub_Team-Handbook_v2.pdf section 2.4.6 and https://robonation.org/app/uploads/sites/4/2024/02/Task-Ideas-Primer_RoboSub-2024_v2.pdf
3. Add the torpedo map object in Unity (see if its worth adding it as a prefab or not)
4. Modify the TaskSelection.cs file to include the torpedo