[Cashtab] [extension address passing p4] Create GetAddress.tsx stub with stories

Summary:
T2550

Depends on D12316

Create a stub component 'GetAddress'. This will be built on later in the stack to fetch and display the extension's active wallet address.

Test Plan:

cd web/cashtab-components
npm run storybook

Navigate to the GetAddress component
Open the dev console
Click the button and note handleGetAddress appears in the dev console

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D12317