TypeScript is better at inferring types when using simple functions and
objects instead of classes. As a result many type annotations have now
been removed without impacting type safety.
Some other benefits are this can be minified better and private fields
are now truly private variables.
This removes the need to explain certain statements and imports need to
happen in a specific order. Users can now just use:
```ts
import { setDiagnosticsOptions } from 'monaco-yaml';
setDiagnosticsOptions({});
```