feat: enhance tracing support with detailed spans

[d0ugal]

Summary

This PR enhances the OpenTelemetry tracing support in the GHCR exporter to match the detailed tracing implementation in the filesystem exporter.

Changes

• collectSinglePackage(): Enhanced with detailed retry tracking, collection events, and duration tracking
• collectOwnerPackages(): Added comprehensive span for owner package discovery with package count and success tracking
• collectPackageMetrics(): Added detailed spans for package info, versions, and metrics update operations
• getPackageInfo(): Added span for API request, JSON decoding, and version count tracking
• getPackageVersions(): Added span for API request, JSON decoding, and version count tracking
• makeGitHubAPIRequest(): Added detailed spans for user/org endpoint attempts with duration and status code tracking
• updatePackageMetrics(): Added span for metrics update operations with download stats tracking
• getPackageDownloadStats(): Will be enhanced in future updates if needed

All spans include:

• Duration tracking for performance analysis
• Success/failure indicators
• Relevant attributes for filtering and analysis (package names, owners, repos, API paths, etc.)
• Error recording with context
• Event markers for important milestones

This provides comprehensive visibility into GHCR exporter operations, similar to what we have in the filesystem exporter.