support typescript aliased imports

[ghost]

Way I verified

1. create a project via CRA
2. change the code in node_modules
3. add paths to tsconfig
4. add some components use aliased import.

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[ghost]

relate to #10911 #10882 #10813

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[mikew]

These paths also need to be mapped in jest. And since CRA already has a concept of webpack + jest module aliasing, it's possible to implement them in modules.js:

https://github.com/mikew/create-react-app/blob/48df474dd00d39ad28a836fd55311ab695465045/packages/react-scripts/config/modules.js#L62-L93

and

https://github.com/mikew/create-react-app/blob/48df474dd00d39ad28a836fd55311ab695465045/packages/react-scripts/config/modules.js#L95-L108

(This is a fork that ditches babel and only uses TS, and with that there's a lot of accommodations that don't need to be made.)

[stale]

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