IframeHTMLAttributes interface is missing referrerPolicy property

[domenicrosati]

Stencil version:

 @stencil/core v1.7.5

I'm submitting a:

[ ] bug report
[x] feature request
[ ] support request => Please do not submit support requests here, use one of these channels: https://stencil-worldwide.herokuapp.com/ or https://forum.ionicframework.com/

Current behavior:

The referrerPolicy property is missing from the IframeHTMLAttribute interface.
Because of this, stencil users are not able to control the referrer policy behaviour of their iframes to things such as limit the referrer information that is sent as a header within a rendered iframe.

Expected behavior:

Stencil users should be able to control the referrer policy behaviour of their iframes.

Steps to reproduce:

Try to set the referrerpolicy on an iframe element in stencil jsx, it won't work.

Related code:

// insert any relevant code here

Other information: