Add endpoint for admin to create new users

[joehand]

Allows admins to create users. This allows skipping of email registration. Useful for centrally managing users or bulk creating users as admin.

[joehand]

I realized this also skips the email whitelist, which wasn't intended but I think that makes sense.

[pfrazee]

I suggest you add tests to make sure you can login and add archives using these accounts. I think you might be missing fields on the user record.

[pfrazee]

https://github.com/datprotocol/hypercloud/blob/master/docs/schemas/leveldb.md#account-object isEmailVerified needs to be set to true

[pfrazee]

Also you need to do the password hashing and etc https://github.com/datprotocol/hypercloud/blob/master/lib/apis/users.js#L61