feat: Error handling

[djschleen]

Adds an Issue struct that can be used to encapsulate issues with SBOMs before services are called to process the SBOMs. Issues are output to STDOUT as warnings.

closes #152
closes #139

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: -1.03 ⚠️

Comparison is base (e847795) 88.28% compared to head (84c1802) 87.25%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #158      +/-   ##
==========================================
- Coverage   88.28%   87.25%   -1.03%     
==========================================
  Files          18       19       +1     
  Lines         768      769       +1     
==========================================
- Hits          678      671       -7     
- Misses         60       68       +8     
  Partials       30       30              

Impacted Files	Coverage Δ
lib/enrichment/epss.go	86.36% <0.00%> (-0.60%)	⬇️
lib/filters/purl.go	0.00% <0.00%> (ø)
providers/ossindex/OSSIndex.go	84.78% <0.00%> (-0.64%)	⬇️
providers/snyk/snyk.go	77.14% <ø> (ø)
renderers/stdout/stdout.go	82.14% <0.00%> (ø)
lib/loader.go	88.31% <77.77%> (+0.65%)	⬆️
lib/util.go	100.00% <100.00%> (ø)
renderers/json/json.go	57.14% <100.00%> (+7.14%)	⬆️

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[mirxcle]

Noice