feat: add devcontainers

[JoshuaLicense]

Description

Adds 3 devcontainers; developer, devops, & complete - each focussed on a different role. Split to create more scoped containers.

devops container:

• Terraform
• Terraform Docs
• TFLint
• Node (20) - for githooks & linting.

developer container:

• PHP 8.3
• Node (20) - for githooks & linting.
• Docker - will be utilised to spin up the VOL application in the future.

I know it's not the correct version, but I don't expect a developer in this repository yet. When this repository becomes a mono-repository the PHP version will be near to PHP 8.3.

complete container:

• All the above.

Related issue: https://dvsa.atlassian.net/browse/VOL-4866

Before submitting (or marking as "ready for review")

• Does the pull request title follow the conventional commit specification?
• Have you performed a self-review of the code
• Have you have added tests that prove the fix or feature is effective and working
• Did you make sure to update any documentation relating to this change?