dillon1000/react

[Blocks] Make it possible to have lazy initialized and lazy loaded Blocks (#18220)

* Lazify Blocks

Blocks now initialize lazily.

* Initialize Blocks eagerly in ChildFiber

This is for the case when it's a new Block that hasn't yet initialized.
We need to first initialize it to see what "render function" it resolves
to so that we can use that in our comparison.

* Remove extra import type line