SolaraViz: Improve Portrayal API

[EwoutH]

However, I'm wondering if we should consider improving this API in a follow-up. The current design feels a bit awkward:

• Simple cases require writing a function wrapper that always returns the same object
• The function --> class pattern isn't the most intuitive

Right now users must write:

def propertylayer_portrayal(layer):
    return PropertyLayerStyle(colormap="viridis", colorbar=True)

Where the function wrapper adds no value when the style is uniform across all layers.

What if we allowed the visualization to accept either:

1. A PropertyLayerStyle instance directly (for simple uniform styling)
2. A callable function (for conditional/per-layer styling)

Similar to how Python's sorted() accepts both key=str.lower and key=lambda x: complex_logic(x).

Originally posted by @EwoutH in https://github.com/projectmesa/mesa/pull/2912#discussion_r2589989850

[ShreyasN707]

@EwoutH Is this issue still open. I would like to work on this.

[codebyNJ]

@EwoutH is this issue still open. I would like to work on this issue