HCK-7662: enable the feature for primary keys in nested attributes (#38)

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<a href="https://hackolade.atlassian.net/browse/HCK-7662"
title="HCK-7662" target="_blank"><img alt="Task"
src="https://hackolade.atlassian.net/rest/api/2/universal_avatar/view/type/issuetype/avatar/10318?size=medium"
/>HCK-7662</a> [BNSF,JMFamily][Document-targets] It should be allowed
for attributes inside nested objects to be marked as PK
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Author: serhii-filonenko

package.json

@@ -52,7 +52,8 @@
             "enableREQueryAndSortCriteria": true,
             "relationships": {
                 "entityNameSeparator": "."
-            }
+            },
+            "restrictNestedFieldsAsPrimaryKey": false
         }
     },
     "description": "Hackolade plugin for Amazon DocumentDB",