wip: keystore import

[gomesalexandre]

Description

WIP Companion PR for shapeshift/hdwallet#703 - just very basic PoC on the web side while this is WIP, however, this is already testable e2e.

Note: This won't match the Figma mocks, as these expects the new wallet design/flow is implemented, which it is not (and we don't even have specced yet AFAIK, cc @shapeshift/product).

TODO:

• make it work
• feature flag for all this, since the flow is most likely to change, this is just a working PR, but with temporary PoC flow.
• make it clean
• make it pretty
• error-handling
• translations

Issue (if applicable)

• closes Keystore wire up #8320

Risk

High Risk PRs Require 2 approvals

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

Testing

• Able to import keystore e2e

Engineering

Operations

• 🏁 My feature is behind a flag and doesn't require operations testing (yet)

Screenshots (if applicable)

• https://jam.dev/c/c1874c70-7763-4350-b843-8e2a46006fec