feat: multi-mode control (server/rans_environment.py)

feat: multi-mode control (server/spacecraft_physics.py)

Add server/tasks/track_linear_angular_velocity.py

Add server/tasks/track_linear_velocity.py

Add server/tasks/go_to_pose.py

Add server/tasks/go_to_position.py

Add server/tasks/base.py

Add server/tasks/__init__.py

Add server/spacecraft_physics.py

Add server/rans_environment.py

Add server/app.py

Add server/__init__.py