feat(typescript): add flag follow aliases when emitting refs

[nbeloglazov]

This PR adds flag that allows follow aliases when retrieving TS symbols for nodes in AST. It relies on TS API and should work well and support multiple levels of aliases.

This fixes bug where today xref is not produced for the following case:

// a.ts
export const value = 42;

// b.ts
export {value} from './a';

// c.ts
import * as b from './b';
b.value;

Previously there were no xref from b.value to value definition. Now there is.

Also it will help to get rid of our custom alias collapsing that uses localSymbolToRemoteReassignMap once launched. I didn't know that I could achieve the same result using TS API when I implemented it originally.