Terraform: Create S3 bucket for doc upload

[SarahJaine]

Description of change

• Update terraform code to create s3 buckets to use for document upload (a field in the activity report)
• Create service binding for s3 buckets

How to test

• Tested against sandbox.
  • There is a new s3 bucket ttahub-document-upload-sandbox in that space > https://dashboard.fr.cloud.gov/services
  • And there is a new service binding for that bucket > https://dashboard.fr.cloud.gov/applications/2oBn9LBurIXUNpfmtZCQTCHnxUM/08d4c228-67c6-47e1-ac9a-bb030c880160/services

Issue(s)

• Create s3 buckets for document upload endpoint HHS/Head-Start-TTADP#149

Checklist

• Meets issue criteria
• Code tested
• [n/a] Meets accessibility standards (WCAG 2.1 Levels A, AA)
• [n/a] Documentation updated - documentation on service binding added in CD: Bind RDS instance #71
  • API methods
  • Boundary and Data Flow Diagrams
  • Architectural Decision Records written for major infrastructure decisions with the Nygard template
  • OSCAL templates completed when security controls are implemented or modified

[jasalisbury]

Looks good! Only have one comment but no need to hold up this PR for it.