[Feature] The ability to upload .csv and .json files.

Can we have like a text field to provide link to an external `.csv` and `.json` file (or just uploading the file) as a datasource to populate the table. And then also have the ability to make any changes to the data and save the final data.

There are number of modules on npm for reading `.csv` or `.json` files such [csvtojson](https://www.npmjs.com/package/csvtojson).