Allow JavaScript components inside of props dict #1319

Current Situation

Libraries like MaterialUI use components within the props dictionary, and this currently isn't supported by ReactPy.

Ref: #989 (comment)

Proposed Actions

To add support for packages including (but not limited to) MaterialUI, we need to spend some additional thought on how to allow JavaScript components to be added as a prop value . This may result in adding some kind of internal flag that signifies "this prop value contains a component".