:sparkles: allow converting between bboxes and polygons

[ianardee]

Description

Add the ability to convert Bbox to and from Polygon objects.

Types of changes

• [ ] Docs change / refactoring / dependency upgrade
• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Requires a change to the official Guide documentation.