[master] Feature: Create records on MailScanner from mailto and mailfrom headers - Attach email on new creaded records

Currently MailScanner only creates Leads, Contacts and Account on MailScanner using mailfrom header data.

It should provide an option to create records using the mailto header. (Ex.: Send a response to a potential lead with BCC: "[email protected]" and automatically create a lead).

Also, it should attach the email to this new record. Currently it populates the "Description" filed with the mail body but do not links the mail.