Allow user to add an account

[0xApotheosis]

Overview

Allow a user to add a new account to a chain that has existing transactions.

Allow a label to be provided to identify the account.

References and additional details

See mockup: https://www.figma.com/proto/OHbVrAVaV2xQWUsq0nKzGm/ShapeShift-Library?node-id=1629%3A6937&scaling=min-zoom&page-id=1265%3A4077&starting-point-node-id=1629%3A6937&show-proto-sidebar=1

Additional user stories for "add account" are noted at https://shapeshift.notion.site/Handle-Multiple-Accounts-a0ac02a4e9704440b08f13a3c619281f.

Acceptance Criteria

User can add and label an account on chains they have transactions on.

Need By Date

No response

Screenshots/Mockups

Estimated effort

No response