Support the popover attribute

[garrappachc]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Versions

4.1.0

Description

When I want to use the popover attribute, e.g.:

<div popover id="my-popover">Greetings, one and all!</div>

I get the following error:

error TS2322: Type '{ children: Element[]; popover: true; class: string; }' is not assignable to type 'HtmlTag'.
  Property 'popover' does not exist on type 'HtmlTag'.

Steps to Reproduce

Use the popover attribute in a HTML tag.

Expected Behavior

The popover attribute is typed as 'auto' | 'manual'.

[arthurfiorette]

Hey @garrappachc, nice feature request, are you up to PR it?

[garrappachc]

Hey @garrappachc, nice feature request, are you up to PR it?

Sure! I'll tackle this soon