Publish threat model in documentation

[evankanderson]

Check in a format threat model, following up on the commitment in https://github.com/cncf/toc/issues/1509#issuecomment-2715743876 (Better late than never!)

Proposed Changes

• Adds a formal threat model for Knative Serving and Eventing
  • This combines the draft contents from the community repo with the AdaLogics report, and adds a bunch of new content that I've been meaning to write. It does not currently include diagrams, though I may add some later.

Once this is merged, I intend to redirect the draft threat model from the community repo to this documentation.

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[dprotaso]

bump @davidhadas

[dprotaso]

@davidhadas @evankanderson anything else here?

[davidhadas]

This looks valuable to me as is. I suggest to approve it.

/lgtm