Add functions for `pymechanical-embedding-examples`

Add the `update_animation` and `set_camera_and_display_image` functions from the `pymechanical-embedding-examples` repository to `pymechanical`. We could put it in the `utils.py` file (to be determined)

Start by comparing the update_animation and set_camera_and_display_image functions in the pymechanical-embedding-examples repository, then inspect pymechanical's utils.py as the proposed destination. Done means both functions are available in pymechanical with behavior matching the example repository; the appropriate module location still needs to be determined.

Written by the indexing model from the issue text.