[CL-622][CL-562][CL-621][CL-632] various drawer improvements (#14120)

- add focus trap to drawers
- add config to open existing dialogs as drawers
- make drawer take up fill width/height on smaller screens

libs/components/src/dialog/dialogs.mdx

@@ -22,6 +22,9 @@ For alerts or simple confirmation actions, like speedbumps, use the
 Dialogs's should be used sparingly as they do call extra attention to themselves and can be
 interruptive if overused.
 
+For non-blocking, supplementary content, open dialogs as a
+[Drawer](?path=/story/component-library-dialogs-service--drawer) (requires `bit-layout`).
+
 ## Placement
 
 Dialogs should be centered vertically and horizontally on screen. Dialogs height should expand to