Allow class component to be referred to in JSX by the class object

[truongsinh]

Allow class component to be referred to in JSX by the class object, instead of tag name. E.g:

return <HelloWord />

Slack discussion: https://stencil-worldwide.slack.com/archives/C79EANFL7/p1604929720060900

[scabana]

Got a feeling that the json doc will be missing stuff for fields:

dependents: string[];
dependencies: string[];
dependencyGraph: JsonDocsDependencyGraph;