Add a way for StyleSheet properties to be tweened

Feature Requests Engine Features
#1

As a Roblox developer, it is currently too hard not possible to apply tweens to properties using StyleSheets. It would great if this was changed as allowing for gradual transitions between a property change would allow for more interesting styling.

I propose the following API design for style sheet tweens:

-- Sets TweenInfo for one property.
StyleRule:SetTweenInfoForProperty(name: string, value: TweenInfo) -> nil

-- Sets TweenInfo for multiple properties.
StyleRule:SetTweenInfoForProperties(table: { [string]: TweenInfo }) -> nil

-- Gets TweenInfo for one property.
StyleRule:GetTweenInfoForProperty(name: string) -> TweenInfo

-- Gets TweenInfo for multiple properties.
StyleRule:GetTweenInfoForProperties(table: { string }) -> { [string]: TweenInfo }

I know StyleSheet’s are currently in beta and therefore are actively being worked on and are subject to change, but I still wanted to make this feature request nonetheless in case this feature wasn’t being planned for StyleSheets.

I’d also like to say that everything I know about StyleSheets was from figuring things out myself so there could be a chance this feature already exists - but I am 85% sure this is not the case. :sweat_smile: