Social Vectors should be part of robofish io

For the quiver plots, the social vectors come from fish_models which would result in a circular dependency. The social vectors should come from robofish.io.utils.

Currently there is a workaround in the tests, so that the test is not executed when fish_models is not installed.

https://git.imp.fu-berlin.de/bioroboticslab/robofish/io/-/jobs/229037#L188