Overlay Drawer component

Changes proposed in this pull request:

• Adds an OverlayDrawer component

How to test

1. Spin up a local server (a CF Token is not needed)
2. Navigate to /prototype/tables
3. Click the "open dialog" button in the top left corner

Notes

• Focus trapping is being handled natively by the element, so the trapping behavior is a bit different than our current USWDS modal in that it extends focus to browser buttons.

Screenshots

Open drawer:

Mobile:

Related issues

Part of #468 (closed)

Submitter checklist

• Added logging is not capturing sensitive data and is set to an appropriate level (DEBUG vs INFO etc)
• Updated relevant documentation (README, ADRs, explainers, diagrams)

Security considerations

None, UI element only