Validate component children

[ElijahAhianyo]

This PR allows a component to explicitly state only allowed child components

usage:

         class TestComponent5(Component):
              tag = "RandomComponent"
      
              invalid_children: List[str] = ["Table"]
      
              valid_children: List[str] = ["Text", "Box"]

closes #1648 #1588

[Lendemor]

Looks good to me.

[masenf]

can you also add

• Text and Center as invalid children of Text
• Tr as the only valid child of Thead, Tbody, and Tfoot
• TableCaption, Thead, Tbody, and Tfoot as the only valid children of Table

This should help us reduce incidence of hydrations errors from silly mistakes

[picklelo]

Looks good! Some comments but I don't think they're critical, we can come back to them in a follow up

[picklelo]

should we keep the check here? Only reason is because if they somehow added children dynamically after creating their component, then we wouldn't catch it. Though I don't think I've seen people really do that...

[picklelo]

nit: we could inline these functions ore define them outside of the function. I've noticed before in Python that defining functions within tight loops is often a performance issue, and these checks will be called many times per compile.

[picklelo]

I'm also thinking in a follow up if these should maybe be List[Type[Component]] rather than str