Test Geometries with hypothesis

[cleder]

PyGeoIf supplies strategies.

Test the roundtrip that serialization/derealization and repr will reconstruct the object faithfully.

355 would probably have been caught with hypothesis property based testing

The Ghostwriter can provide a good starting point :ballot_box_with_check:

Add Tests for:

• [x] Coordinates
• [x] Points
• [x] Linestring
• [x] Polygon
• [ ] MultiGeometry

[cleder]

Almost done, to-do:

• refactor tests to avoid duplication
• reproducible tests for MultiGeometry