feat: add default color (color.ROBOFLOW)

[mostafahanafi]

Description

Fixes #1587 - adds default color sv.Color.ROBOFLOW to draw functions and polygon annotator.

Type of change

• [x] New feature (non-breaking change which adds functionality)

How has this change been tested, please provide a testcase or example of how you tested the change?

Functions can now be called without specifying a color, as default ROBOFLOW color is used

[CLAassistant]

All committers have signed the CLA.

[LinasKo]

The solution is correct and well-implemented. Normally I would merge this, however we already have another contributor working on this, with a similar PR. Unfortunately I have to close this.