Extend rectangle shape to allow for both inner and outer borders, at any distance from the main shape body.

No additional instance parameters has been added. Instead, the negative values of both border and inset values are used to allow extra capabilities. Additionally, the small (<1px) gap between border and body caused by anti-aliasing has been fixed.

https://github.com/enso-org/enso/assets/919491/0ae709f2-db7b-4a45-a9d3-7fbb8802dc8c


<img width="657" alt="image" src="https://github.com/enso-org/enso/assets/919491/40e5963d-0717-4662-abf4-b9687aa921ed">