Is there API to pull Email SMTP login and password from the settings page to be used in a custom plugin?
No there is not. There is however in-process APIs to send email that makes it unnecessary.
Telligent.Evolution.Extensibility.Apis.Get<Telligent.Evolution.Extensibility.Api.Version2.ISendEmail>()
Will this support adding an attachment to the email?
Yes, however the file must be a centralized file, meaning you can attach an arbitrary file, it has to be stored as part of the platform CFS system.
