[JAVA] fix toUrlQueryString for BigDecimal (#15764)

* add MyImportTest.java

* fix original issue

* fix same issue for native library

* remove MyImportTest

* add test configs

* generate samples (again?)

* generate samples again

* generate samples again, undo pom.xml mistake [amended to retrigger circliCi]

samples/server/petstore/php-laravel/lib/app/Http/Controllers/FakeController.php

@@ -230,6 +230,25 @@ class FakeController extends Controller
 
         return response('How about implementing testGroupParameters as a delete method ?');
     }
+    /**
+     * Operation fakeBigDecimalMap
+     *
+     * .
+     *
+     *
+     * @return Http response
+     */
+    public function fakeBigDecimalMap()
+    {
+        $input = Request::all();
+
+        //path params validation
+
+
+        //not path params validation
+
+        return response('How about implementing fakeBigDecimalMap as a get method ?');
+    }
     /**
      * Operation testBodyWithBinary
      *