refactor: split evaluations into SBOM or License for given user input

[spiffcs]

Summary

The main change for this PR surrounds the reporting structure and how grant parses user requests.

• Grant generates a Report which is a summary of all user requests. A user's requests can constitute any of the following:
  • a path to an SBOM file
  • a path to a license
  • a path to an archive
  • a path to a directory (with any of the above)
  • or some container image

Example grant command showing the different inputs

• grant check gpl (Single License)
• grant check alpine:latest (Single Image)
• grant check ubuntu.spdx.json (Single SBOM)
• grant check ./contents (Folder where grant will check each item to run an eval against)
• grant check alpine:latest, ubuntu.spdx.json (Multiple source: image and sbom)
• syft -o json ubuntu:latest | grant check MIT, alpine:latest, wolfi.spdx.json, ./contents (Everything all at once)