[Server] Review and enhancement on GraphQL APIs performance

[robertu7]

Checklist

• [x] Upgrade Apollo Studio to Team Plan;
• [ ] Review performance metrics (trace breakdown, cache hits, etc.) on Apollo Studio;
• [ ] Review DB indexes & performance insight on AWS RDS;
• [ ] Review recent changes on matters-server

Discussion

• https://mattersnews.slack.com/archives/C88CK7Q7L/p1656496480746279