Create API for managing groups

motivation: let users outside RC team to add/remove members to groups message interface - rabbitmq (ongoing project) restful API - decide how to go about it

added Backlog label

changed the description

https://uab-rc.slack.com/archives/C9YB78YSX/p1712080823546409

Links to information about Purdue RC's customer management system Halcyon. It's got a lot of the features we're interested in pursuing for the future like self-management or accounts and storage, and APIs for the same. It's built on Laravel. High-level overview slides: https://www.rcac.purdue.edu/files/publications/Gateways2021_Halcyon_Unified-HPC-Center-Operations.pdf GitHub: https://github.com/PurdueRCAC/halcyon