Refractor, cleanup, centralizing variables and function

[viveksahu26]

This PR adds the following changes:

• Globalized GitHub Adapter Utility Functions:

  • Moved GitHub-specific utility functions to a shared location under "source", ensuring reusability across all source adapters.
  • This prevents code duplication and adheres to the DRY (Don't Repeat Yourself) principle.

• Replaced repo with Namespace in SBOM Assets:

  • Previously, repo was used to differentiate SBOMs when fetching from an organization, treating each repository as a separate entity.
  • However, to make sbommv more generic and extensible for all adapters, we replaced repo with Namespace.
  • So, now it can be used for differentiating SBOMs from repositories (GitHub) or directories (Folder Adapter).

• Globalized Interlynk Adapter Variables such as UploadSettings and UploadMode, so that other output adapter can resuse this.