Add data classification tagging and catalog integration

[jzonthemtn]

Summary

Phinder finds PII in files and objects but does not tag or label the sources. Results exist only in Phinder's reports and are not written back to the data sources or integrated with data catalogs.

Proposal

Add classification output integrations:

• Write tags back to S3 object metadata or Azure Blob metadata
• Emit findings to data catalog systems (OpenMetadata, DataHub, Apache Atlas)
• Support custom tag schemas for organizational classification frameworks
• Enable automated labeling workflows (e.g., tag objects containing SSNs as "PII-High")

Acceptance Criteria

• Phinder tags discovered PII with classification labels (e.g., HIPAA, PCI, FERPA)
• Tags exportable in a format compatible with data catalog tools (e.g., Apache Atlas, AWS Glue, Collibra)
• Classification rules configurable per policy
• Tests cover tagging and export for representative data
• Documentation describes catalog integration