fix: render Common Extensions propertly in React 16 (#5930)

Avoid mapping Immutable.Map as React children.
Co-authored-by: NVladimir Gorej <vladimir.gorej@gmail.com>

Ref https://github.com/immutable-js/immutable-js/issues/667

src/core/components/parameter-row.jsx

@@ -274,7 +274,7 @@ export default class ParameterRow extends Component {
             { isOAS3 && param.get("deprecated") ? "deprecated": null }
           </div>
           <div className="parameter__in">({ param.get("in") })</div>
-          { !showCommonExtensions || !commonExt.size ? null : commonExt.map((v, key) => <ParameterExt key={`${key}-${v}`} xKey={key} xVal={v} /> )}
+          { !showCommonExtensions || !commonExt.size ? null : commonExt.entrySeq().map(([key, v]) => <ParameterExt key={`${key}-${v}`} xKey={key} xVal={v} /> )}
           { !showExtensions || !extensions.size ? null : extensions.map((v, key) => <ParameterExt key={`${key}-${v}`} xKey={key} xVal={v} /> )}
         </td>
 

src/core/plugins/oas3/components/request-body.jsx

@@ -150,7 +150,7 @@ const RequestBody = ({
                         <div className="parameter__type">
                           { type }
                           { format && <span className="prop-format">(${format})</span>}
-                          {!showCommonExtensions || !commonExt.size ? null : commonExt.map((v, key) => <ParameterExt key={`${key}-${v}`} xKey={key} xVal={v} />)}
+                          {!showCommonExtensions || !commonExt.size ? null : commonExt.entrySeq().map(([key, v]) => <ParameterExt key={`${key}-${v}`} xKey={key} xVal={v} />)}
                         </div>
                         <div className="parameter__deprecated">
                           { prop.get("deprecated") ? "deprecated": null }