Design a better approach to widget defaults

[bitspittle]

Currently, we have code like this:

object InputDefaults {
    const val Valid = true
    const val Enabled = true
    const val ReadOnly = false
    const val Required = false
    const val SpellCheck = false
    val Size = InputSize.MD
    val Variant = OutlinedInputVariant
}

@Composable
private fun <T : Any> Input(
    type: InputType<T>,
    value: T,
    enabled: Boolean = InputDefaults.Enabled,
    valid: Boolean = InputDefaults.Valid,
    required: Boolean = InputDefaults.Required,
    readOnly: Boolean = InputDefaults.ReadOnly,
    spellCheck: Boolean = InputDefaults.SpellCheck,
) { ... }

This is inspired by Jetpack Compose and does the job -- but what if we want to allow users to change these defaults in their own applications?

We should consider a different approach here, either doing something like exposing mutable defaults that get frozen at silk initialization time, or by using composition local providers. The latter could be useful if it makes sense to change defaults for some subsection of your site; while the former if defaults should be set once everywhere.