dillon1000/react

Implement JSX whitespace rules

So far we've been preserving JSX whitespace all the way through to codegen. But 
JSX has clear rules around whitespace handling, which allows us to trim 
whitespace in the input in lots of cases. For the most part this doesn't change 
our output, but I think that’s generally because of prettier. This PR should 
make a big difference when debugging the compiler, by removing all the 
whitespace JsxText values. 

But in some edge-cases it really makes a difference in the output since we can 
avoid memo slots for strings like `"\n      "`.. 

## Test Plan 

* Experimented with our internal tool to verify transform output to confirm that 
JSXText whitespace does not impact fbt transform results. 

* Synced and tested profile page, looks fine