Highlight JSX in TypeScript.

[thesoftwarephilosopher]

This PR adds JSX highlighting to TypeScript natively using Monaco's Monarch tokenizer, along with a few other nice to have changes:

1. Highlight ... as a keyword
2. Highlight export/etc as control-flow keywords
3. Highlight class fields
4. Highlight function/class names
5. Highlight var/let/const names
6. Highlight new Foo
7. Highlight function/method calls
8. Highlight JSX
9. Highlight type names as type.identifier

It has been thoroughly tested on https://vanillajsx.com/monarch/ but it would be useful to have more people test for edge cases.

A few unrelated tests are failing such as PHP and Less, which I don't understand how they're related since my code is isolated to one file. The failures look to just be whitespace errors, but it's hard to tell.

I didn't update the TypeScript tests yet, so they're failing too.

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[shihui-huang]

Hi @thesoftwarephilosopher, Thank you so much for sharing this token provider file. It's very helpful and straightforward, and it solved my problem very easily!

I noticed a small inconsistency where the first and second brackets had different tokens in some cases. I made a slight modification to make them consistent.
Before:


After:

Suggested change

	[/{/, { token: 'keyword', next: '@root.INJSX', bracket: '@open' }],
	[/{/, { token: 'delimiter.curly', next: '@root.INJSX', bracket: '@open' }],

[shihui-huang]

Suggested change

	[/{/, { token: 'keyword', next: '@root.INJSX', bracket: '@open' }],
	[/{/, { token: 'delimiter.curly', next: '@root.INJSX', bracket: '@open' }],

[shihui-huang]

And I think it would be more fitting to categorize ... as an operator