Update boundary detection in FSD feature extraction

[FattanePourakpour]

np.argwhere does not trace boundaries accurately; instead, trace_object_boundaries is used.

[cooperlab]

@FattanePourakpour please address the complex curvature problem also mentioned in Issue #1139 and then let's look at getting the tests to pass.

Most tests compare to stored values so we would need to generate new values since the new algorithm is fundamentally changed.

[manthey]

@FattanePourakpour I see you have some commits why say "black". The codebase predates the existence of black and uses flake8 and autopep8. tox -e format will apply the autopep8 rules. They differ from black (for instance, preferring single quotes), and linting will fail with black's rules.

[FattanePourakpour]

@manthey thank you for the clarification. I will do tox -e format and commit again.