Automatic merge from submit-queue

Internal audit API

Forked from https://github.com/kubernetes/kubernetes/pull/45315

I pulled out only the internal audit API types and would like to merge this to unblock the audit implementation work while we figure out the versioned types and code generation.

I will continue to iterate on https://github.com/kubernetes/kubernetes/pull/45315, but lets get this internal type submitted.

/cc @ericchiang @ihmccreery