enhance(cve-feed): re-organize code and cut srctl osv blob into cve feed

[Daniel-Giszpenc]

Issue: tooling: add the OSV CVE information to the official CVE feed #177

Work Done:

• add JSON OSV blob to the CVE JSON feed under the custom _kubernetes_io object
• organize fetch code into into functions in a way that felt more readable and cleanly segmented step by step

Work Not Done Yet:

• osv source object
• pull osv from cve-feed-osv repo when not available in github issue
• readme improvement for contributing to the tool

A lot of the work I did here was just going off of PR #183 which itself was going off of PR #181. This PR should close both of these mentioned PRs when completed.

Considering the scale of refactor I did to cleanup in what is my personalized view and some work not being done yet this is only a draft for now but feedback is very welcome.

[k8s-ci-robot]

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This pull-request has been approved by: Daniel-Giszpenc
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[k8s-ci-robot]

Hi @Daniel-Giszpenc. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[Daniel-Giszpenc]

Didn't realize making the PR myself wouldn't assign me, my bad.
/assign