Auto creation of team sub-contexts via integrations

[LongLiveCHIEF]

new threads/channels/groups should be able to automatically be created for any integration impact is linked to, such that a new sub-context will become available inside of a chat context, when a new context is created within the integration.

sub-context: a channel or group, existing within an impact team.

Let's take github for example:

You should be able to associate an impact team to either a github organization, or a github team.

• Whenever a new github team is added to a github organization that is associated to an impact team, it should automatically create a new sub-context inside the `impact team
• Whenever a new github repository is added to a github team associated with an impact team, it should create a new sub-context

Considerations

• Privacy/visibility settings of the new context item from the integration (new github team/repo), should carry over, or sync via LDAP, to the access and visibility of the sub-context in impact.
• The privacy/visibiltiy settings could determine what type of sub-context is created. For example, if a github team is publicly visible, perhaps a channel is added to the impact team. However, if the github team is not publicly visible, then it creates a private group inside the impact team.