`Classname` prop for all components

[ksiabani]

Is your feature request related to a problem? Please describe.
It's not possible to directly pass a className prop to all Matte components.

Describe the solution you'd like
Pass a className prop to all Matte components.

Describe alternatives you've considered
The only way to do this now is to wrap a Matte component with another valid JSX element, which is not that convenient.