feat(overlay): add option to provide a custom element container for the…

[vlio20]

add option to provide a custom element container for the overlay to be attached to. By default the overlay is attached to the document, but there are cases when the container should be different. One such example is to have a dialog element (the native dialog), overlays that are attached to the body appearing behind the dialog. Attaching the overlay to the dialog will fix the issue.

resolves #15571

[vlio20]

@crisbeto, so there is no way to make the overlay to appear in front of a native dialog?

[crisbeto]

Cleaning up old PRs and closing this one since it was already possible using DI. As for native dialogs, that's a different issue that we're looking into resolving by using native dialogs for our own overlays.

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