Add mock service for logging sent emails.

[masterkram]

Add a mock service which logs emails to the console instead of sending them. For development purposes.
Uses consola to format the email:

This can be used in your app as follows:

const provider = process.env.NODE_ENV === 'development' ? 'mock' : 'mailgun'; // replace mailgun with whatever provider you use
useEmail(provider).send({
    to: "test@test.com",
    from: "test@test.com",
    subject: "Test",
    text: "Test",
});