Add store and data type to the JSON column mapping for imports

[timlight10]

It would be great to have the store ID and data type (product, category, brand) inside of the JSON column mapping text, as this would save several clicks during the import procedure.

Right now, one must make sure that the correct store is selected, and that the correct data type is selected before they paste the JSON column map file.

I am proposing allow paste of JSON column map right after (or even with) the CSV file upload, so that those two steps are skipped and one can jump right to the import action.

https://abantecart.atlassian.net/wiki/spaces/AD/pages/16777227/Import+Wizard#JSON-Data-Column-Mapping