Implement new setup key resource (#178)

This change implements a new resource called SetupKey that manages the
lifecycle of setup keys and stores them in secrets.

A major change here is that we are also switching to using SSA for
resource management.

Part of #172

Signed-off-by: Philip Laine <philip.laine@gmail.com>

pkg/applyconfigurations/internal/internal.go

@@ -0,0 +1,46 @@
+// Code generated by controller-gen. DO NOT EDIT.
+
+package internal
+
+import (
+	fmt "fmt"
+	sync "sync"
+
+	typed "sigs.k8s.io/structured-merge-diff/v6/typed"
+)
+
+func Parser() *typed.Parser {
+	parserOnce.Do(func() {
+		var err error
+		parser, err = typed.NewParser(schemaYAML)
+		if err != nil {
+			panic(fmt.Sprintf("Failed to parse schema: %v", err))
+		}
+	})
+	return parser
+}
+
+var parserOnce sync.Once
+var parser *typed.Parser
+var schemaYAML = typed.YAMLObject(`types:
+- name: __untyped_atomic_
+  scalar: untyped
+  list:
+    elementType:
+      namedType: __untyped_atomic_
+    elementRelationship: atomic
+  map:
+    elementType:
+      namedType: __untyped_atomic_
+    elementRelationship: atomic
+- name: __untyped_deduced_
+  scalar: untyped
+  list:
+    elementType:
+      namedType: __untyped_atomic_
+    elementRelationship: atomic
+  map:
+    elementType:
+      namedType: __untyped_deduced_
+    elementRelationship: separable
+`)