Expose ShadowDOM properties

[greaka]

Stencil version:

 @stencil/[email protected]

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:

Currently, stencil does not expose all of the shadow dom properties.

Expected behavior:

I expected #1623 to also include the attach mode.

Steps to reproduce:

Related code:

// insert any relevant code here

Other information:

Why is mode not supported? Is there a workaround for now?

[rwaskiewicz]

Closing this in favor of #4111, which I believe is asking for the same thing (and has a little more visibility/upvotes)