[Paywalls V2] Updating UIConfig aliased colors to contain both light and dark

[joshdholtz]

Motivation

Aliased color will be both light and dark

Description

This ended up being a whole thing...

TL;DR - Added a new DisplayableColorScheme object that has types of hex, linear, and radial...

PaywallComponent.ColorScheme -> DisplayableColorScheme->Color/Gradient`

Issue

We have .alias as a value on ColorInfo but we need to alias an entire set of light/dark colors (aka ColorScheme).

Our logic right now directly converts ColorInfo into a SwiftUI/UI color (for foreground, background, etc). This works fine for hex, linear, and radial but will not work well for alias. We need to perform the alias lookup at the ColorScheme level (near the view model layer instead of at the render layer)

Solution

Create a new DisplayableColorScheme and DisplayableColorInfo struct. These new data structures only have values for hex, linear, and radial.

ColorScheme (and ColorInfo) get mapped to DisplayableColorScheme (and DisplayableColorInfo) and in this mapping is where the alias look up happens. This makes it safer/cleaner at the render level because everything has a specific color now.

The converting to DisplayableColorScheme currently will fallback to a clear color if there is an error and log an error. We will EVENTUALLY AND SOON (in a follow up PR) add this validation that the alias exists in the creation of the view models so that we can error out early if needed.

NOTE: We will also add big backend validation that the alias colors exist so the SDKs will never (🤞) have to encounter an alias color not existing.