[Cashtab] [extension address passing p9] Display the received address in the GetAddress.tsx component

Summary:
T2550

Depends on D12321

Fetch and display the address from the extension in the GetAddress component

Test Plan:

cd web/cashtab-components
npm run storybook

With your local build version of the extension active, click "Get Address" button from the "GetAddress" component. Notice that the input field is populated with the extension's active wallet address.
Change the active wallet in the extension and push "Get Address" again. Note new address now populates.

Reviewers: #bitcoin_abc, kieran709

Reviewed By: #bitcoin_abc, kieran709

Differential Revision: https://reviews.bitcoinabc.org/D12323