Add new React function component jsx ppx #3452
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See reasonml/reason-react#351 for corresponding React changes.
This (re)introduces jsx version 3 and allows people to default their entire project to the new version through a ppx. When using version 3, jsx compiles into something very similar to JS - React.createElement(component, props, ...children). This gets us a 0-cost, 0-runtime binding for React.
Tested in a local repo with all combinations of (None, Some 2, Some 3) in bsconfig.json and in bs.config attribute.