Add Luau types

[JohnnyMorganz]

Adds Luau types to (most) of the functions.

This is best effort, some things cannot currently be typed (correctly) yet, but we cover the most common uses. This shouldn't emit any false positives.

The following types are exported:

• Hooks, the second parameter of a functional component. Contains useState etc.
• RenderFunction<Props>, the functional component which has been "hook-ified"
• HookOptions<Props>, the options passed in Hooks.new

defined as

export type Hooks = -- inferred --
export type HookOptions<Props> = {
	name: string?,
	defaultProps: { [string]: any }?,
	componentType: string?,
	validateProps: ((props: Props) -> (boolean, string?))?,
	[string]: { NO_EXTRA_ARGS: never },
}
export type RenderFunction<Props> = (props: Props, hooks: Hooks) -> any

The following are now correctly typed:

• The functional component passed to Hooks.new(Roact)(component, options): it takes props and hooks, and should return one value [we currently cannot enforce that one value is a RoactComponent]
• The options passed to the above
• useState
• useEffect
• useValue (auto inferred type)
• useCallback
• useMemo
• useReducer

useContext, useBinding and Roact are unfortunately not currently typed as we do not have enough info about them.

Adding these types provide improved intellisense when using Luau LSP / Roblox Studio

Example Screenshots

[Kampfkarren]

CHANGELOG please

[JohnnyMorganz]

@Kampfkarren any movement on this?

[Kampfkarren]

I forgot. I'll just assume these are correct :P

[fewkz]

Can there be a wally release for this? This would be incredibly useful