Add benchmark for containerized KRM function in kustomize

hack/krmFunctionBenchmark/example_tshirt/containerfn/data.yaml

@@ -0,0 +1,20 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx
+  labels:
+    app: nginx
+  annotations:
+    tshirt-size: small # this injects the resource reservations
+spec:
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx

hack/krmFunctionBenchmark/example_tshirt/containerfn/kustomization.yaml

@@ -0,0 +1,4 @@
+resources:
+- data.yaml
+transformers:
+- transf.yaml

hack/krmFunctionBenchmark/example_tshirt/containerfn/transf.yaml

@@ -0,0 +1,8 @@
+apiVersion: examples.config.kubernetes.io/v1beta1
+kind: tshirt
+metadata:
+  name: tshirt
+  annotations:
+    config.kubernetes.io/function: |-
+      container:
+        image: gcr.io/kustomize-functions/example-tshirt:v0.2.0