Anonymize member creation for activities if listed in erasure requests

[skwowet]

Changes proposed ✍️

What

copilot:summary ​ copilot:poem

Why

How

copilot:walkthrough

Checklist ✅

• [x] Label appropriately with Feature, Improvement, or Bug.
• [ ] Add screenshots to the PR description for relevant FE changes
• [ ] New backend functionality has been unit-tested.
• [ ] API documentation has been updated (if necessary) (see docs on API documentation).
• [x] Quality standards are met.

Summary by CodeRabbit

Release Notes

• New Features

  • Introduced a command-line utility for anonymizing member data.
  • Enhanced database schema to support unique combinations of member identities.
  • Added functionality to create deterministic anonymized usernames.

• Improvements

  • Updated member activity processing to streamline identity anonymization requests.
  • Enhanced error handling and logging for anonymization processes.
  • Improved management of identity erasure and anonymization requests within the repository.

• Bug Fixes

  • Resolved issues related to identity erasure request handling in the database.