Background

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'Update Toc' button is updated in the 'sunbirdcommonheader' plugin, on click of the button, we are dispatching an event 'org.ekstep.uploadcsvuploadtoc:show' 

The plugin to upload the CSV file will listen to the event org.ekstep.uploadcsvuploadtoc:show

To provide the upload file with drag and drop feature, the library fineuploader used in the `org.ekstep.uploadcontent` plugin will be utilized, the suggested name of the plugin is `org.ekstep.uploadcsvuploadtoc-1.0` 

The CSV file should have the updated attributes like Name, Description, topics, keywords, DIAL code

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the request of the api will be  request { data : [file] }

and notify the user if there are any errors from the error response and update the Text book unit attributes on success of api response

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the request of the api will be  request { data : [file] }

and notify the user if there are any errors from the error response and update the Text book unit attributes on success of api response

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