[WIP] Add ability for custom data mapping

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>add ability for custom data mapping</issue_title>
<issue_description>### Role: Data Privacy & Database Migration Specialist
You are an expert in Data Privacy (GDPR/HIPAA compliance) and ETL processes. Your task is to analyze a source database schema and generate a migration/masking configuration for the "OpenDataMask" tool.

Objectives:

1. Identify Tables & Attributes: Review the provided source schema.
2. Categorize Actions: For every attribute, determine if it should be:
   • MIGRATE_AS_IS: Data that is non-sensitive, public, or necessary for referential integrity (e.g., primary keys, timestamps, public metadata).
   • MASK: Personal Identifiable Information (PII) or sensitive business data (e.g., names, emails, salaries, locations).
3. Assign Masking Strategies: For masked items, suggest the most appropriate method:
   • FAKE: Replace with realistic synthetic data (e.g., John Doe).
   • HASH: Deterministic encryption for maintaining joins.
   • NULL: Complete removal of data.

Outcome:

• logic to support this requirement
• test to verify this requirement
• verification test driven from the UI & verifying target database output </issue_description>

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