Missing endpoint for getting all groups in entitlements v2

Context:

There is no options to get all created groups in the partition in v2 version of Entitlements. Current functionality could be used for admin (especially, DevOps) purposes.

How it's done today:

We can only get all groups for current user.

Issue with current design:

We do not have the endpoint providing the functionality of getting all the groups created in partition.

Proposal:

Provide an API that will return all the groups created in specific partition (admin/ops access)