[FEATURE]: Polygonize segmentation masks

[srmsoumya]

Is your feature request related to a problem? Please describe.
Deep Learning models are not perfect in delineating the building or road boundaries. People tend to use Douglas-Peucker (DP) algorithm to smooth out the polygons.

Describe the solution you'd like
I would like to have a list of algorithms to try & see what works best for my specific problem.

Additional context
There are some proposed solutions that seem to work better than DP algorithm for polygon simplification.

• https://github.com/microsoft/USBuildingFootprints#stage-2-polygonization
• https://arxiv.org/pdf/2007.12587.pdf
• https://hal.inria.fr/hal-01530460/document