Better errors for non-exported types

// @filename a.ts

declare function foo(): any

declare function bar(): any;

export { bar };

// @filename b.ts

import { foo, bar } from "./a";

Currently we provide the following error messages:

Module '"./a"' has no exported member 'foo'.
Module '"./a"' has no exported member 'bar'.

We could instead provide the errors:

Module '"./a"' declares 'foo' locally, but it is not exported.
Module '"./a"' declares 'bar' locally', but it is exported as 'baz'.

Also using the

'{0}' is declared here.

related span.

Later on, we could provide quick fixes to respectively

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