feat(cdk/menu): Add backdrop support and maybe able to customize all overlay options in CDK Menu

### Feature Description

I think the [CDK Menu Trigger](https://github.com/angular/components/blob/main/src/cdk/menu/menu-trigger-base.ts) should provide an ability to set a backdrop in the overlay and also other `OverlayConfig` options.

### Use Case

This lets us create a custom Menu closer to the Mat Menu which already supports a transparent backdrop.

Start with src/cdk/menu/menu-trigger-base.ts and review how the CDK Menu Trigger creates its overlay, then compare the requested behavior with the existing Mat Menu backdrop support. Done means the trigger can provide a backdrop and expose the relevant OverlayConfig options needed to create a custom menu comparable in this respect to Mat Menu.

Written by the indexing model from the issue text.