Add mapper for mapping form body to blocks

[MAILPOET-2451]

assets/js/src/form_editor/store/form_body_to_blocks.jsx

@@ -0,0 +1,26 @@
+export default (data) => (
+  data.map((item) => {
+    const mapped = {
+      clientId: item.id,
+      isValid: true,
+      innerBlocks: [],
+    };
+    switch (item.id) {
+      case 'email':
+        mapped.name = 'mailpoet-form/email-input';
+        mapped.attributes = {
+          label: item.params.label,
+          labelWithinInput: !!item.params.label_within,
+        };
+        return mapped;
+      case 'submit':
+        mapped.name = 'mailpoet-form/submit-button';
+        mapped.attributes = {
+          label: item.params.label,
+        };
+        return mapped;
+      default:
+        return null;
+    }
+  }).filter(Boolean)
+);