Make `Jsx.component` abstract (#8390)

* Make Jsx.component abstract

* Fix shadowing issue

* Clean up

* More recursive binding fixes

* CHANGELOG

* Format

* Simplify

* Fix playground test

* Fix recursive @react.componentWithProps

* Introduce %component_identity

* Fix gentype tests

* Fix LSP hover regression from JSX component coercion

* Improve error message for plain functions used as JSX components

* Another error message improvement

* Improve comment

* Clearer error messages