admin_audit should log group creation/deletion

[GitHubUser4234]

Hi,

For some use cases, it would be useful to have audit logs of group creation and deletion. The postCreate and postDelete hooks are already there, they just need to be hooked in. Thank you.

[MorrisJobke]

cc @ChristophWurst @Ivansss @pfiff45

[GitHubUser4234]

As it is merged, let's close it. Thanks a lot!