[Feature Request] Flat Colour Mesh

[Hakazaba]

Validations

• I have checked for similar feature requests and could not find any.
• I have made sure this is not an already-existing feature.

Description

I would like to be able to draw a polygroup which is then fulled with a flat colour of pixels, this would then then be able to be used as masks or for other purposes without the need to create large and basic objects that wouldn't have to take up atlas space.

Suggested solution

Add a colour full option to polygroups

Alternative solution

Create a new node type that performs this function. Gradients may also be a useful option.

Additional Context

No response