feat: export part function

[JaeAeich]

Description

Styling of component leverages on css parts, with encapsulation and abstraction of design schema via design package, package-author utilises predefined components and their css parts. For a new package hardcoding css part and exporting them again might not be the most scalable and efficient way. Therefore we need to create a publich method or a function exported by design package that package-author can pass the name of the component to & it can provide with the string to put in the exportparts.

[SalihuDickson]

@git-anurag-hub, i think this is an approach that could make parts on the package authors side a bit more manageable.