Auth/reset password and some auth changes

[siddhantk232]

This PR introduces a reset-password feature:

• Authenticated users can change their password by going to /-/auth/set-password/
• Unauthenticated (logged out) users can request password reset by goind to /-/auth/forgot-password/. This sends an email with a link to set their password.

Auth changes

• /-/auth/create-account/: requires two new json body params, password2 and accept_terms. See the integration tests to learn what has changes in request body.
• /-/auth/create-account/: redirect to /-/auth/resend-confirmation-email/ on successful requests. This same route can be used to re-request confirmation emails in cases where user does not receive email.
• FASTN_ENABLE_EMAIL: new environment variable for use during development. This will be used to log emails to the console instead of actually sending it. This removes the need of FASTN_SMTP* environment variables.
• req_config.request.ud() checks on server session before returning the user. This enables invalidation of logged in users on password reset.

Refactor

• Route enum to keep track of auth related routes.

What happens when a github user tried to reset their password?

The /-/auth/set-password, used when authenticated, converts their github oauth account to a normal email_password account. After doing this, they can use both the github login and the email_password login method.

Same goes for /-/auth/forgot-password/, entering their github username/email will send an email with a link to set their password. Check https://github.com/siddhantk232/fastn-test-multiauth to test things out.

[amitu]

@siddhantk232 there are some conflicts, please resolve. We have switched to using .starttls_relay() (SMTP with StartTLS extension) as it seems neither AWS SES, nor postmark work with .relay() (SMTPS). Ideally we should make both protocol and port configurable.

[siddhantk232]

There's a way to disable sending emails in dev mode (using FASTN_ENABLE_EMAIL) so we can live with .starttls_relay() for a short while. I'll later add more options for these in mail.rs