* restore pistache from codegen 2.x
* update pistache samples with oas2
* update pistache with oas3 petstore (no diff)
* restore datatype for array of model
* update pisache server scripts
* Revert "restore datatype for array of model"
This reverts commit 3b949a3873f3fca78311065173eda26e786dedec.
* fix array of models in method signature