LJ-366 Add Attachments sql models

[JadeCara]

Closes LJ-366

Description Of Changes

Added Attachments and Attachments references tables with alembic migration to create them. Added tests for basic functionality.

Code Changes

• Added Attachments table definition to sql_model.py
• Added AttachmentReference table definition to sql_model.py
• Added Enum models for Attachment Types and Attachment Reference Types
• Added to AuditLog Enums for attachment activities.
• Added unit tests for:
  • create, and delete functionality
  • foriegn key and null constraints

Steps to Confirm

1. There should be no functionality changes.
2. Verify tests run as expected
3. Verify new tables are created through alembic migration.

Pre-Merge Checklist

• Issue requirements met
• All CI pipelines succeeded
• CHANGELOG.md updated
  • Add a db-migration This indicates that a change includes a database migration label to the entry if your change includes a DB migration
  • Add a high-risk This issue suggests changes that have a high-probability of breaking existing code label to the entry if your change includes a high-risk change (i.e. potential for performance impact or unexpected regression) that should be flagged
• Followup issues:
  • Followup issues created (include link)
  • No followup issues
• Database migrations:
  • Ensure that your downrev is up to date with the latest revision on main
  • Ensure that your downgrade() migration is correct and works
    • If a downgrade migration is not possible for this change, please call this out in the PR description!
  • No migrations
• Documentation:
  • Documentation complete, PR opened in fidesdocs
  • Documentation issue created in fidesdocs
  • If there are any new client scopes created as part of the pull request, remember to update public-facing documentation that references our scope registry
  • No documentation updates required

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.21%. Comparing base (18cc518) to head (6f0a65e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5784      +/-   ##
==========================================
+ Coverage   86.91%   87.21%   +0.30%     
==========================================
  Files         394      394              
  Lines       24432    24455      +23     
  Branches     2641     2641              
==========================================
+ Hits        21235    21329      +94     
+ Misses       2628     2549      -79     
- Partials      569      577       +8     

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