feat(gui-agent): add image detail calculator for enhanced screenshot processing

[ZhaoHeh]

Summary

New Features

• Image Detail Calculator: Added ImageDetailCalculator type for dynamic detail level calculation based on image dimensions
• Enhanced Configuration: Extended GUIAgentConfig to support both detailCalculator options

Code Organization

• Centralized Defaults: Moved default implementations to a dedicated defaultImpls.ts file for better maintainability

Checklist

• Added or updated necessary tests (Optional).
• Updated documentation to align with changes (Optional).
• Verified no breaking changes, or prepared solutions for any occurring breaking changes (Optional).
• My change does not involve the above items.

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