feat(medusa, utils): Allow object feature flags (#4701)

Feature flags can be set as follows:

**Environment variables**
```
MEDUSA_FF_ANALYTICS=true
MEDUSA_FF_WORKFLOWS=createProducts,addShippingMethods
```

**Project config**
```
{
  featureFlags: {
    analytics: true,
    workflows: {
      createProducts: true,
      addShippingMethods: true,
    }
  }
}
```

packages/utils/src/common/object-from-string-path.ts

@@ -0,0 +1,75 @@
+/**
+ * Convert a collection of dot string into a nested object
+ * @example
+ * input: [
+ *    order,
+ *    order.items,
+ *    order.swaps,
+ *    order.swaps.additional_items,
+ *    order.discounts,
+ *    order.discounts.rule,
+ *    order.claims,
+ *    order.claims.additional_items,
+ *    additional_items,
+ *    additional_items.variant,
+ *    return_order,
+ *    return_order.items,
+ *    return_order.shipping_method,
+ *    return_order.shipping_method.tax_lines
+ * ]
+ * output: {
+ *   "order": {
+ *     "items": true,
+ *     "swaps": {
+ *       "additional_items": true
+ *     },
+ *     "discounts": {
+ *       "rule": true
+ *     },
+ *     "claims": {
+ *       "additional_items": true
+ *     }
+ *   },
+ *   "additional_items": {
+ *     "variant": true
+ *   },
+ *   "return_order": {
+ *     "items": true,
+ *     "shipping_method": {
+ *       "tax_lines": true
+ *     }
+ *   }
+ * }
+ * @param collection
+ */
+export function objectFromStringPath(
+  collection: string[]
+): Record<string, any> {
+  collection = collection.sort()
+  const output: Record<string, any> = {}
+
+  for (const relation of collection) {
+    if (relation.indexOf(".") > -1) {
+      const nestedRelations = relation.split(".")
+
+      let parent = output
+
+      while (nestedRelations.length > 1) {
+        const nestedRelation = nestedRelations.shift() as string
+        parent = parent[nestedRelation] =
+          parent[nestedRelation] !== true &&
+          typeof parent[nestedRelation] === "object"
+            ? parent[nestedRelation]
+            : {}
+      }
+
+      parent[nestedRelations[0]] = true
+
+      continue
+    }
+
+    output[relation] = output[relation] ?? true
+  }
+
+  return output
+}