target_contact entry for targets of type team

Hi,

I've finally gotten Iris and Oncall integrated but I have a question.

It would seem the default behavior when a target is `team` is to individually email all members of a given team, rather than looking in the `target_contact` table to see if a defined team in the database has a `mode` assigned to it. For instance, I can see in my `target` table that I have a team with a `type_id` of 2, which of course means team, but the way the tables are structured it would seem as though I can assign a `mode` to any `target` in `target_contact`.

I think it would make sense for the app to look at this first before determining which members are in a given team and emailing them individually (it would certainly make organizations' SMTP servers happier for large teams of people). This would also be nice for teams that have a rotating oncall phone number that everyone forwards their phones to when their shift starts. The default behavior of course being individual messages, unless a team has any `modes` assigned to it in `target_contact`.

Is this possible?

No files, tests, or entry points are identified. Start by locating the code that resolves team targets and consult the target and target_contact tables; done would mean a team's assigned mode is used before individual member delivery, while preserving individual messaging as the default.

Written by the indexing model from the issue text.