Give a warning when logging in with unverified account

[ayys]

Motivation

Make it clear to users that they cannot perform certain actions (like publishing packages/apps) if their email is not yet verified.

Proposed solution

When logging in, throw a warning along the lines of Account {username} does not have a verified email. This means you have limit access to wasmer features. To verify your account, go to https://wasmer.io/settings/profile.

$ wasmer login
...
Login for Wasmer user "{username}" saved

WARNING: Account `{username}` does not have a verified email. This means you have limit access to wasmer features. 
To verify your account, go to https://wasmer.io/settings/profile.