refactor: Update WikidataAPI component to standard output pattern

[raphaelchristi]

Description

This PR refactors the WikidataAPI component to follow the standard component pattern with data/text outputs and proper tool mode implementation.

Changes

• Removed tool-specific implementations (LCToolComponent, StructuredTool)
• Changed base class to Component
• Added standard data and text outputs
• Implemented tool mode for fetch_content method
• Simplified code structure and error handling
• Improved data formatting and text output

Before/After

Before: Component used LCToolComponent with tool-specific implementations After: Component follows standard pattern with data/text outputs and selective tool mode