[task #15578] Function to find if polygon vertices are sorted anti-clockwise

[Sachin Kumar Singh]

Follow-up Comment #1, task #15578 (project gnuastro):

The winding number
<https://www.element84.com/blog/determining-the-winding-of-a-polygon-given-as-a-set-of-ordered-points>
method seems to be a good fit for this and is also easy to implement. This
should do it:-)

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