CustomEvent type information not output as expected

[gavinbarron]

Hi, Thanks for this really useful library, I'm part of the team working on Microsoft Graph Toolkit. We're currently using web component analyzer to help us build our React wrapper library @microsoft/mgt-react

We're looking to improve the developer experience for consumers of our web components by adding the information to the Generic types used when emitting CustomEvents, I found #169 and the linked playground which looks exactly like what we need, so it might be that #157 will resolve this?

I experimented with both 1.1.6 and 2.0.0-next.4 and got the same result in my trials to get better type information.

Given the jsdoc comment fragment on a web component:

* @fires {CustomEvent<IDynamicPerson[]>} selectionChanged - Fired when set of selected people changes

I get varying output depending on the output type with a loss of fidelity that is problematic for our scenario. Markdown:

| Event              | Type                            | Description                               |
|--------------------|---------------------------------|-------------------------------------------|
| `selectionChanged` | `CustomEvent<IDynamicPerson[]>` | Fired when set of selected people changes |

json2

"events": [
  {
    "description": "Fired when set of selected people changes",
    "name": "selectionChanged",
    "type": "CustomEvent"
  },

The type that is present in the md output is exactly what I'd expect to be provided when producing json2 output