Enter/Backspace should add/remove fields when editing form data

[crtl]

When using Multipart Form as type of body content in Requests currently you have to manually click the "Add" button to add a new field (each time).
This may work when having a small amount of fields but gets very annoying when having a large number of fields.
As a workaround you would press the button multiple times to create an abundance of fields and remove unused rows afterwards.

Instead pressing the ENTER key in the value field should add an empty row below the current field if no empty row is already present below.
Vise versa pressing the BACKSPACE key in the name field should remove a row if it is empty (no name nor value is present).

With this you can add remove fields using your keyboard only without having to tab through the whole UI and pressing any buttons.