Implement function to check whether account has password - currently checking for ethereum validity

Summary: This differential implements utility function to check whether an account has password. Currently this operation is logically equivalent to check whether currentUserInfo is null or logged out or represents ethereum account (returns false). returns true otherwise.

Test Plan: Create SIWE account and log return result of this function. Should be false. Then in normal account log the result of this function. Should be true.

Reviewers: tomek, atul

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D6095