feat(docs): Populate Developer Portal with comprehensive documentation framework (#35217)

Co-authored-by: Claude <noreply@anthropic.com>

docs/developer_portal/viz-plugins/transforming-data.md

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+---
+title: Transforming Data
+sidebar_position: 4
+---
+
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+
+# Transforming Data
+
+🚧 **Coming Soon** 🚧
+
+Master data transformation techniques to prepare and optimize data for your visualization plugins.
+
+## Topics to be covered:
+
+- Data transformation pipeline architecture
+- Understanding query results structure
+- Implementing transform props functions
+- Data aggregation and grouping
+- Filtering and sorting operations
+- Data type conversion and validation
+- Handling missing and null values
+- Performance optimization for large datasets
+- Caching and memoization strategies
+- Error handling in data transformations
+
+## Transformation Patterns
+
+### Data Preparation
+- **Normalization** - Converting data to consistent formats
+- **Aggregation** - Grouping and summarizing data
+- **Pivoting** - Reshaping data for different chart types
+- **Joining** - Combining multiple data sources
+- **Filtering** - Removing irrelevant data points
+
+### Chart-Specific Transformations
+- **Time series** - Date parsing and time-based grouping
+- **Geographic data** - Coordinate conversion and mapping
+- **Hierarchical data** - Tree and nested structure handling
+- **Network data** - Node and edge relationship processing
+- **Statistical data** - Distribution and correlation analysis
+
+### Performance Considerations
+- Lazy evaluation and streaming
+- Incremental data processing
+- Client-side vs server-side transformations
+- Memory management for large datasets
+- Parallel processing techniques
+
+## API Reference
+
+- Transform props function signature
+- Available utility functions
+- Data structure interfaces
+- Error handling patterns
+
+---
+
+*This documentation is under active development. Check back soon for updates!*