change notification_logs database table

[sibow]

in the notification_logs table the message field is similar to all email recipients, so it is better to be split into two, one with message and date (parent) and the other with recipients, status, and other info, this way we save more space.

[sibow]

I am not changing the table but changing the code so that we put the notification list in two groups, the first list will have the successful email send operation and the other one for the failed one.
We aggregate all the email list in the recipient field with one email message for all.

[sibow]

completed