Instance Collision Shape Dimensions are Static

[CianFlint]

Proposal to make the dimensions of a collision shape non-static. It should be possible to adjust the dimensions of the shape of a 2d node instance without globally affecting the shape of all instances of the scene

[CianFlint]

Should this be made into a bug report

[AThousandShips]

This isn't static, you just need to make them unique, you are sharing the shape (which is a resource) with other instances of the same resource

[Calinou]

This is already what #4672 aims to address (but in a different manner).