esmoduleinterop: Improve error message when calling static method on class

TypeScript Version: master

Code

b.d.ts:

declare class C { static m(): void }
declare namespace C {}
export = C;

import * as C from "./b";
C.m();

Expected behavior:

src/a.ts(1,1): error TS7038: A namespace-style import will import a module namespace object, not a class.
src/a.ts(2,3): error TS2339: Property 'm' does not exist on type 'typeof C'.

Actual behavior:

src/a.ts(2,3): error TS2339: Property 'm' does not exist on type 'typeof C'.

Reproduce the example using b.d.ts and src/a.ts, starting with the TypeScript compiler's handling of namespace-style imports and static member lookup. Confirm the current diagnostic and compare it with the expected TS7038 and TS2339 messages; done means the additional namespace-object warning appears without losing the existing property error.