Simplify compute_bounds function

[tathey1]

There is a function that, given a component in a segmentation, computes the bounding box with a certain padding (here). However this can be simplified by utilizing the regionprops method in skimage.

I could see the mpnp constructor computing regionprops on the labels then saving this as a state variable. Then, compute_bounds could use the 'bbox' field in the region props to compute the padded bounds.

[github-actions]

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[github-actions]

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[Swarnlataaa]

please assign the issue to me.

[anviimishra]

I'm interested in helping with this!

[tathey1]

Things have updated since I posted this so the function in question is here now. It would be good to sketch out (like on paper) what the change would involve. i.e. is there going to be a new class attribute/variable? If so when will it be initialized? Maybe we should set up a timing benchmark experiment to make sure that any changes would actually be faster because that's the number one priority at this point.