Need an API to transfer subgroups to a different parent group
### Problem to solve
Make an API available to move subgroups to different parent group.
### Further details
The feature to move a subgroup to a different parent is only available through the UI. It would be extremely helpful to manage that through API
### Proposal
Make a group transfer API available which honors appropriate gitlab permission of group owner (or maintainer?) which could be used to move/transfer subgroups to a different parent group.
### What does success look like, and how can we measure that?
API being available in future release of gitlab
### Links / references
Support ticket : https://support.gitlab.com/hc/en-us/requests/102525
issue