Add create email endpoint

Steppon

Hi,

currently the API does not support neither creating a new mailthread nor adding a mail to an existing thread. This is very unfortunate as our SDRs are working with multiple email accounts for domain reputation reasons. The current email sync feature only allows to sync one email account...

Even funneling all accounts into a "main" account will not solve this issue since not all emails are supposed to be synced with pipedrive.

We are really looking forward to use the API in a way that we can finally sync the emails we need to seemingly use pipedrive in our workflow eliminating copy & pasting.

Best regards,
Steppon