Enhance Sendgrid support to be able to select IP pool

Feature: Select the outgoing IP pool in Sendgrid

Description: In Sendgrid we have multiple IP pools; transactional, marketing, campaigns and currently Auth0 emails go out from a random one. This is not ideal and we’d like to segment all our transactional activity including Auth0 emails through the proper pool. Sendgrid provides more options in their api like this and these aren’t available in Auth0.

Use-case: Sending emails through segmented IP pool from Sendgrid provider

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With the requirements at Gmail and Yahoo’s New Sender Requirements: A Closer Look | Twilio SendGrid coming into effect in a few days this is going to be quite important if you use SendGrid to send from multiple domains. Each domain needs an IP address pool and SPF and reverse DNS enforce the IP address that emails can come from.