Contact Form: Add Email Piping

It would be great if Jetpack supported sending contact form to a specific email address based on selections in the form. This would be good for companies with multiple departments or a non profit even which is my use case.

Start by locating Jetpack's contact-form implementation and its email delivery path. Define how a form selection maps to a recipient and verify routing for multiple departments, including the reported nonprofit use case. The issue provides no file, test, or acceptance criteria, so confirm scope with maintainers before coding.

Written by the indexing model from the issue text.