Allow transparent membership/ownership

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Feature request

In Talk we can add teams to conversations since a long time.
Recently mentions of teams were added.

Now the problem is that I as a team lead own all the sub-teams we have:

• Talk Backenders
• Talk Frontenders
• Talk Mobile
• Talk Design
• Talk Team

However that makes me currently a "member" of said teams and if someone pings the "Talk Mobile" devs I still receive a notification and blue unread marker, even though it's not my expertise.

It would be helpful if people owning/moderating/managing a team could either define for the team if "managers" are also "members" or each manager themselves decides if they are a "member" or whether their membership should be "transparent".