Configure backend TypeORM to talk to Aurora-Postgres DB in RDS

[KihyeokK]

• Aurora is an AWS optimized integration of Postgres. We currently use Aurora-postgres instead of plain Postgres database on AWS RDS.
• TypeORM probably needs to use a "data api driver" to connect to RDS database, and code changes will need to be made. It seems like DataSource can't be used anymore. Hints:

1. https://geniusee.com/single-blog/typeorm-Integration-with-aurora-data-api
2. https://github.com/ArsenyYankovsky/typeorm-aurora-data-api-driver#
3. https://github.com/typeorm/typeorm/blob/022d2b5f622771349355f00a087c26c930db0d25/src/driver/aurora-postgres/AuroraPostgresConnectionOptions.ts#L6