feat: add summary objects

[vladklokun]

What this PR changes?

This commit:

• Introduces a new API type: SBOM Summary. The new type acts as a lightweight beacon that will be created whenever an SBOM is created, so the Storage APIServer can avoid loading entire large SBOMs into memory when listing and serving Watch requests.
• Ditto for new type Vulnerability Manifest Summary.
• Fixes a conflict with Makefile that was introduced when creating a build directory in the source tree.

[github-actions[bot]]

Summary:

• License scan: success
• Credentials scan: success
• Vulnerabilities scan: success
• Unit test: success
• Go linting: success