Batch upload

A new playground module called “Batch upload” should be created. This module should enable users to create batches by uploading any number of files. These batches can be referenced on the ID and Path resources for PUT and POST methods by clicking on a “Reference a batch” button. The user will then select a batch and that provides a JSON string which can be copy pasted in the body of the request for referencing the batch.
Batches can be used on automation too. You can either upload a file/files using file widget or reference a batch id.
There should be a text in the module explaining the principle and how batch upload can be used.