[Cashtab] Move wallet mgmt to its own screen

Summary:
T2207

Depends on D15884

Move the Collapse-based wallet mgmt settings to their own screen. Rebuild it without antd.

Test Plan: npm test

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Subscribers: emack

Differential Revision: https://reviews.bitcoinabc.org/D15917