Implement Phase 3: Multi-attribute search AND logic and Phase 4: Sort by attribute columns

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Phase 3 - Multi-attribute Search:
- Add parse_attribute_search() method to parse search syntax like
  'color: blue size: large' or 'color:blue AND size:large'
- Update search_by_attributes() to support AND/OR logic for multiple
  attribute queries
- Add search_by_attribute_value() private method for single value search

Phase 4 - Sort by Attribute Columns:
- Add get_attribute_sort_definition_id() method to detect attribute
  column sorting
- Update Item::search() to join attribute tables when sorting by
  attribute columns
- Update tabular_helper to make attribute columns sortable
- Add sanitizeSortColumnAttribute() method in Items controller to
  validate attribute definition IDs as sort columns

Fixes #2722 - sorting by attribute columns now works

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