Merge pull request #12302 from sbueringer/pr-block-int-imports

✨ Block imports to internal packages in our API + restructure import restrictions

Author: k8s-ci-robot

api/.import-restrictions

@@ -0,0 +1,11 @@
+rules:
+  # Enforce that our APIs do not depend on internal packages.
+  - selectorRegexp: .*internal.*
+    allowedPrefixes: []
+    forbiddenPrefixes: []
+  # Enforce that our APIs do not depend on CR packages.
+  # This is overwritten e.g. in packages that require conversion.
+  - selectorRegexp: sigs[.]k8s[.]io/controller-runtime
+    allowedPrefixes: []
+    forbiddenPrefixes:
+      - "sigs.k8s.io/controller-runtime"