feat(bottom-sheet): support drag handle

### Feature Description

Material spec defines support for dragging a bottom sheet

https://m3.material.io/components/bottom-sheets/overview

### Use Case

_No response_

Start with the Angular Material bottom-sheet component and compare its current behavior with the linked Material Design specification. Determine the required drag-handle interaction and identify the relevant component tests or entry points before making changes. Done means bottom sheets support dragging in accordance with the specification, with tests covering the behavior.

Written by the indexing model from the issue text.