feat: added rectangle border

[deniszhigalov]

Added a new mask shape "Rectangle border", as well as a new parameter rectangle_border_width with type number with default value 3. In fact, now you can use your shape for face detection.

[w-e-w]

sorry forgot about this PR

so I'm assuming that what you're trying to achieve is to draw the detected regions and labels
like the nudenet demo https://nudenet.notai.tech
as opposed to apply censoring to just the border of a region correct?

if so I'd rather do a rework of the pipeline and just drow the regions

on the other hand if what you want is to apply censoring to just the border (I really can't think of reason why)
then I would implement it differently as opposed to adding a new shape, I'll probably just add something like checkbox that toggle the fill color, this way it will work for all shape