#13890 Implementing JSX.ElementType support

[antanas-arvasevicius]

Implementing #13890. Code now for review and will add tests if this will be accepted at all.

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[msftgits]

Hi, I am closing and re-opening this PR to bump the CLA bot. Sorry for the inconvenience!

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[antanas-arvasevicius]

Hi, I've added conformance tests for all scenarios of JSX.ElementTypeProperty declarations.

[RyanCavanaugh]

Per comments in #13890 and offline discussion, I think we want to go in the direction of #14729 as the next step here. I appreciate the work here but #14729 will be a broader solution to the problem, so hopefully we can take action on that at some point based on feedback and use cases.

[antanas-arvasevicius]

No problem. Had a good time in exploring typescript internals and it's hard to believe that compiler's code can be read so nicely. It can be used as a teaching literature :-)