Refactor osinfo Container Scanner

[micahhausler]

This change starts to move individual OS type logic out to individual implementations and files.

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This change will make it easier to write and test new OS types for bom generate --scan-images

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

I tried to keep the osinfo package API as close to the same as possible. I made the containerScanner and layerScanner interfaces and their implementations internal to the package as they're not currently used externally.

Does this PR introduce a user-facing change?

NONE

[saschagrunert]

Code LGTM

PTAL @puerco
/hold

[cpanato]

/lgtm

thanks

[micahhausler]

/remove-label do-not-merge/hold

[k8s-ci-robot]

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[micahhausler]

/remove-label hold

[k8s-ci-robot]

@micahhausler: The label(s) /remove-label hold cannot be applied. These labels are supported: api-review, tide/merge-method-merge, tide/merge-method-rebase, tide/merge-method-squash, team/katacoda, refactor. Is this label configured under labels -> additional_labels or labels -> restricted_labels in plugin.yaml?

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[puerco]

Thanks @micahhausler ! It needed a refactor badly, it grew to the current Frankenstein slowly over the years and I had my eye on it for a while.

/lgtm
/approve
/hold cancel

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, micahhausler, puerco, saschagrunert

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