add rule to warn about type-only imports of classes with emitDecoratorMetadata

[ajafff]

// @experimentalDecorators: true
// @emitDecoratorMetadata: true

// @filename: a.ts
export class C {}

// @filename: b.ts
import type { C } from "./a";
declare const decorator: ClassDecorator;

@decorator
export class B {
    constructor(private p: C) {}
}

There should be a finding on the type-only import of C in b.ts as C would be used in the metadata if its type was available.
Since auto-import only appends to existing import statements, it's easy to introduce such an import without noticing. This might cause some hard to debug errors with your favorite dependency-injection library.