Batch

[DerThorsten]

• added batch API for pybox2d
• this is not fitting very well to the existing batch api since we also pass an array of colors
• might need refactoring

[martinRenou]

We should document those new methods in a follow-up PR

[DerThorsten]

@martinRenou the "Test / build" part of the CI fails with some python 3.10 related error in jupyter_packaging https://github.com/martinRenou/ipycanvas/runs/4239573498?check_suite_focus=true#step:4:16

[DerThorsten]

We should document those new methods in a follow-up PR

I can also update the docs in this if you prefer that =)

[martinRenou]

It's fine in another PR :)

[martinRenou]

We'll need to update jupyter-packaging I guess... But let's do that in a separate PR too. Thanks!