Update/iterator efficiently: Improving Memory

[viveksahu26]

The PR introduces a memory-efficient solution by implementing an iterator-based approach. Here’s how it works:

• Lazy Loading: Instead of loading all SBOMs into memory at once, the updated sbomProcessing function uses an iterator to fetch and process SBOMs one at a time. This ensures that only a single SBOM resides in memory at any given moment, and reducing the overall memory consumption.
• On-Demand Conversion: The PR includes a ConvertingSBOMIterator struct that wraps the original iterator. When the destination is Dependency-Track (Dtrack), this iterator converts each SBOM to the required format (CycloneDX) only when it’s needed—lazily, rather than upfront. For other destinations, it skips the conversion entirely, avoiding unnecessary memory use.