Support for Custom Elements

[break-stuff]

Is your feature request related to a problem? Please describe.

🚀 feature request

Description

There doesn't seem to be a way to extend the language server for custom elements/web components.

Feature Type

What does this bug affect

• Angular Language Service VSCode extension
• Angular Language Service server

Describe the solution you'd like

Vue and JSX templates provide an interface that can be extended to include additional tag names, attributes/available values, and documentation. Something consistent with that would be very helpful.

Describe alternatives you've considered

Have you considered any alternative solutions or workarounds?

Anything else relevant?

[atscott]

Duplicate of angular/angular#12045

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