Fixes for stats, accuracy, speed

Fixes:
1) Statistics after the pull has been completed
2) Increase the speed of the pull process by calling the part of the array on every queue task rather than whole array and this process has been changed to 'sync list' from 'sync contact'
3) Assign the mailchimp contact to default group even the mailchimp group information present but the mailchimp contact is not assigned to any group
4) Change the user friendly label to mailchimp navigation menu
5) Modify the query to cover all the properties(like is_primary, is_deleted) for matching contact
6) Update the contact's firstname/lastname for matching record if only firstname/lastname details are present for that contact in mailchimp
7) Unset the contact's type of individual for matching record while updating