Improve support for JavaScript component children #1262
Description
Current Situation
Currently, JavaScript components are fairly janky in terms of support for having children elements. This includes children that are either server-side or JavaScript components.
This has resulted in usability issues in things such as ReactPy-Material.
Proposed Actions
Test and fix all edge cases for JavaScript component children. Ideally, they should be able to be mix-and-matched with anything, in any order.