shouldPreload

Pre-loads and caches trigger paywalls and products when you initialize the SDK via `Superwall/configure(apiKey:purchaseController:options:completion:)-52tke`. Defaults to true.

Set this to false to load and cache paywalls and products in a just-in-time fashion.

If you want to preload them at a later date, you can call `Superwall/preloadAllPaywalls()` or `Superwall/preloadPaywalls(forEvents:)`