Core logic rewrite and refactor.

[bomoko]

The PR introduces some code reorganization to make future work simpler, as well as adds some new tests.

Changes introduced

• Separates the gathering of facts from incoming unstructured types (i.e. configMap reads) from actually writing those facts. This was a single step before - but this is a change towards SRP.
• Gets rid of "interface" type - thereby supporting better static type checking across the entire system.
• Deprecates support for 'sbom' and 'image' types. The build-deploy tool only actually sends 'sbom-gz' and 'image-gz' types since we introduced compression. Supporting both paths introduces needless complexity.
• Deprecates support for the 'direct' fact type introduced Feature/trivy parser facts #18 - this has been replaced by the 'direct.facts' and 'direct.problems' types
• Because of previous deprecations above, we can, further, deprecate processing of non-binary payloads in general for non-typed/direct insights payloads.

[timclifford]

This PR gives me strong healing/cleansing vibes 😆