Create a typescript custom transformer for auto registry items

**Enhancement**
One of the most useful parts of registries in `widget-core`, is the ability to lazy load widgets. At the moment to do this, you need to change the form of the `w` call from:
```
w(MyWidgetClass, {});
```
to
```
w<MyWidgetClass>('my-widget-class', {});
```
This will allow TypeScript to elide the import as it's only used as a type. The user will also then have to register `my-widget-class` to the registry somewhere.

Although this works, it would be nicer if the user didn't have to change their code at all. We instead take the configuration we already have from the `.dojorc` for bundles, and do the above work for them. 

This would mean modifying the source code from something like this:
```typescript
import WidgetBase from '@dojo/widget-core/WidgetBase';
import { w } from '@dojo/widget-core/d';
import Foo from './widget/Foo';
import Bar from './widget/Bar';

export default class Baz extends WidgetBase {
	render() {
		return v('div', [
			w(Foo, {}),
			w(Bar, {})
		]);
	}
}
```
to:
```typescript
import WidgetBase from '@dojo/widget-core/WidgetBase';
import { w } from '@dojo/widget-core/d';
import { registry } from '@dojo/widget-core/decorators/registry';

const __registryItems__ = {
	'unique_identifier_a': () => import('./widget/Foo'),
	'unique_identifier_b': () => import('./widget/Bar')
};

@registry(__registryItems__)
export default class Baz extends WidgetBase {
	render() {
		return v('div', [
			w('unique_identifier_a', {}),
			w('unique_identifier_b', {})
		]);
	}
}
```


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Create a typescript custom transformer for auto registry items #19

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Create a typescript custom transformer for auto registry items #19

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