Add fuzzing audit report and blogpost

[AdamKorcz]

cert-manager has completed its fuzzing audit. This PR adds a blogpost and a report about the work.

cc @wallrj @maelvls @SgtCoDFish @inteon

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[SgtCoDFish]

I've reworked this a bit to pass our checks and to change the wording slightly in places. Also adds a thank you at the bottom which we couldn't leave out 😁

[SgtCoDFish]

This is awesome, by the way - I'm really looking forward to sharing the word about this!

[inteon]

Text looks good to me.
Thanks a lot @AdamKorcz for the massive amount of work!
/approve
/lgtm

[cert-manager-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: inteon

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[inteon]

/lgtm