system hooks: missing events for group/project members (group in group, group in project)

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Problem to solve

Groups and projects have the functionality of inviting a group as a member:

• Invite a group to a project
• Invite a group to a group

However, there are no system hooks generated when groups are added/removed from groups/projects via such invitations.

Proposal

Implement system hook events for the above-mentioned actions. Something like this:

• group_add_to_group
• group_add_to_team
• group_remove_from_group
• group_remove_from_team
• group_update_for_group
• group_update_for_team

alternatively, these actions may be "expanded" and mapped to existing/corresponding user_* events

see https://docs.gitlab.com/ee/administration/system_hooks.html