refactor: Removes pin and password from Redux

[tuliomir]

This PR removes the Pin and Password information from Redux, and instead keeps it in the smallest scope possible within the component state of the NewWallet and LoadWallet screens.

This avoids any future bugs where the Redux store cleanup fails or even security issues should the Redux store happen to leak.

Acceptance Criteria

• Pin and Password should never be stored on Redux

Notes

To facilitate the refactor, the ChossePassword and ChoosePin components were refactored to functional components.

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.