Create OnePasswordItem API and controller

Command executed: `operator-sdk create api --version v1 --kind OnePasswordItem --resource --controller`
`--group` flag is skipped because we don't have a group in the previous version of the operator and we want to make things consistent and not bring any breaking changes.

config/crd/kustomizeconfig.yaml

@@ -0,0 +1,19 @@
+# This file is for teaching kustomize how to substitute name and namespace reference in CRD
+nameReference:
+- kind: Service
+  version: v1
+  fieldSpecs:
+  - kind: CustomResourceDefinition
+    version: v1
+    group: apiextensions.k8s.io
+    path: spec/conversion/webhook/clientConfig/service/name
+
+namespace:
+- kind: CustomResourceDefinition
+  version: v1
+  group: apiextensions.k8s.io
+  path: spec/conversion/webhook/clientConfig/service/namespace
+  create: false
+
+varReference:
+- path: metadata/annotations