Adds --ignore-file functionality

[djschleen]

closes #111
closes #119

[codecov]

Codecov Report

Base: 87.55% // Head: 88.25% // Increases project coverage by +0.70% 🎉

Coverage data is based on head (cc672d9) compared to base (fcea0a1).
Patch coverage: 94.28% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
+ Coverage   87.55%   88.25%   +0.70%     
==========================================
  Files          17       18       +1     
  Lines         747      766      +19     
==========================================
+ Hits          654      676      +22     
+ Misses         63       60       -3     
  Partials       30       30              

Impacted Files	Coverage Δ
formats/cyclonedx/cyclonedx.go	100.00% <ø> (ø)
formats/spdx/spdx.go	100.00% <ø> (ø)
formats/syft/syft.go	100.00% <ø> (ø)
lib/enrichment/epss.go	86.95% <ø> (ø)
providers/ossindex/OSSIndex.go	85.41% <ø> (ø)
providers/osv/osv.go	82.22% <ø> (+6.66%)	⬆️
providers/providerfactory.go	100.00% <ø> (ø)
renderers/json/json.go	50.00% <ø> (ø)
renderers/rendererfactory.go	100.00% <ø> (ø)
renderers/stdout/stdout.go	82.14% <ø> (ø)
... and 7 more

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[zroll]

There are styling failures that should be addressed.

[djschleen]

@zroll Ping me on Slack about the style issues?