Create a rotate() function

[AlphaRLee]

Contact @AlphaRLee (Richard Lee) or @lawruble13 (Liam Wrubleski) if you need help/guidance.
See Issue #88 for a similar issue

AC:

• Implement rotate(radians) to match this doc: https://ipycanvas.readthedocs.io/en/latest/transformations.html
• Add unit tests
• Talk with @Descent098 to add documentation

[AlphaRLee]

Re-opened, missing docs