feat: add tryItOutEnabled configuration (#6865)

* feat: add tryItOutEnabled configuration

allow users to set tryItOutEnabled: true to display
the "Try it out" section by default

tryItOutEnabled to take === "true" for the
query string value or === true if someone
implements query string type parsing in the query

src/core/containers/OperationContainer.jsx

@@ -7,8 +7,11 @@ import { Iterable, fromJS, Map } from "immutable"
 export default class OperationContainer extends PureComponent {
   constructor(props, context) {
     super(props, context)
+
+    const { tryItOutEnabled } = props.getConfigs()
+
     this.state = {
-      tryItOutEnabled: false,
+      tryItOutEnabled: tryItOutEnabled === true || tryItOutEnabled === "true",
       executeInProgress: false
     }
   }