Create staging models, source definitions and data profiling documentation

[Ritik574-coder]

Summary

Implemented the staging layer for the retail analytics project. Added Bronze source
definitions, created staging models for all source tables, and documented data
profiling findings identified during source data analysis. This establishes the
foundation for downstream intermediate and mart layer transformations.

Changes made

• Created Bronze source definitions in _retail__sources.yml

• Added source documentation for:

  • customers
  • employees
  • inventory_snapshots
  • products
  • returns
  • reviews
  • sales_transactions
  • stores

• Created staging models for all Bronze source tables

• Configured source references using source() macros

• Added profiling-based source descriptions highlighting data quality issues

• Validated model dependency structure and source connectivity

• Organized staging models by business domain

Validation

• Commands tested locally (if applicable)
• Docs links checked
• No secrets committed
• CI passes

Related issues

N/A

Notes for reviewers

This PR focuses only on the staging layer and source documentation.
Transformations, standardization logic, and business rules will be implemented
in the intermediate and mart layers. Source descriptions are based on data
profiling observations from the Bronze layer and intentionally exclude
transformation details.

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