[FEAT] Create LA 311 Data infrastructure using Terraform

[mattyweb]

Goal:
have the server infrastructure built with Terraform.

Benefits:
The benefits are that all the infrastructure would be stored as code and be visible to anyone working on the project. We could standardize on having all HackforLA projects use similar (though not identical) approaches with Terraform. This would allow anyone with Terraform experience to be able to support any of the projects (at least in theory).

Features:

• Create VPC, subnets, network ACLs, security groups, and gateways
• Create ALB and ECS cluster
• Create Postgres RDS

[mattyweb]

Work is done. Change was made to merge dev and prod. These environments now share networks, ELB, bastion, and RDS. Costs are about 1/2 the previous levels.