Space admins to have the ability of inviting Guests directly

Currently, the Invite guests for external collaboration involves a pre-requirement of a site-admin / org admin first inviting external collaborators via the Administration panel, before Space admins are then able to add these guests to their space permissions.

This Suggestion aims to flexibilize and customize this process so that customer's space admins can have the ability to invite external e-mails from collaborators (e.g. contractors, etc.) directly, without the required involvement of a site-admin / org admin. 

Having the need of inviting the guest first with the help of a site/org admin eliminates the benefit of the tool for several customers.