Module restructure

[richardhallett]

Purpose

This PR is to demonstrate the new module structure for creating and configuring app services.
Currently just uses OAI as a simple example.

Approach

Terraform modules allow us to reuse code see https://developer.hashicorp.com/terraform/tutorials/modules

Environments Directory - This will be where specific workspace setups using the modules will go
Modules Directory - Where reusable components and services can be configured.

Open Questions and Pre-Merge TODOs

Learning

Terraform docs cover in detail a lot of how to structure this.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

Reviewer, please remember our guidelines:

• Be humble in the language and feedback you give, ask don't tell.
• Consider using positive language as opposed to neutral when offering feedback. This is to avoid the negative bias that can occur with neutral language appearing negative.
• Offer suggestions on how to improve code e.g. simplification or expanding clarity.
• Ensure you give reasons for the changes you are proposing.