Add support for copying Network Request/Response data in plain text

It would be way more beneficial to have the ability to "Copy Data" instead of "Copy Curl" when looking at a network request details. Being able to copy the entire information that is shown in the network details really helps testing teams with providing all of the information including timestamps and headers and other metadata.

The request is just to replace the "Copy Curl" button with the "Copy Data" button and when clicked, the FLEX tool will traverse through all of the data being displayed in the network request details and then copy that data to the pasteboard. It doesn't have to copy the response data since there is a separate screen that allows you to do that.

I have added this functionality on a fork and hope to be able to create PR to integrate it into the main project. I would like to get feedback to whether others think this is useful