feat: add support for "react-jsx" and jsxImportSource

[dsherret]

Couldn't push updates to that PR because "allow commits from maintainers" was disabled, so opening a new one to get this landed. Will land with attribution.

Closes #139
Closes #10

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2 out of 3 committers have signed the CLA.

✅ dsherret
✅ benStre
❌ Benedikt Strehle

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