Allow to use Ctrl+Supr to remove piece of text in the command line

[ghost]

Problem

Usually in VSCode and other terminal emulators you're able to remove the last piece of code with Ctrl+Supr.

For example, given the command git clone https://, it would remove all the text from the currently selected position until it finds a symbol or space. One key press would lead to git clone https, another would lead to git clone, etc.

Proposal

Implement this shortcut

Prior Art (Optional)

I will post a demonstration soon because I am having problems accessing Github on GNOME Web. Also, willing to do it myself if someone points out how it's done :)

[ghost]

Sorry, github mobile app directed me here. elementary/terminal#714