feat(openai): add comprehensive image generation instrumentation

- Implement image generation, editing, and variation instrumentation
- Add proper OpenTelemetry span creation and attribute tracking
- Support token usage calculation for DALL-E 2/3 models
- Include image upload callback mechanism for base64 processing
- Add comprehensive test coverage with HTTP recordings
- Follow gen_ai semantic attribute conventions
- Install @types/node dependency for TypeScript compilation

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: nirga

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