Add a feature to copy a portion of text from the terminal output

[brizaldi]

It would be very useful if we could copy partial content from the terminal output.

Currently, we can only copy using the Copy button provided by the cell UI, but that button will copy all the text.

[sourishkrout]

Hi @brizaldi! Thanks for filing this issue. So the idea is to "respect" the selection inside the terminal for the copy button?

[brizaldi]

@sourishkrout Yes, but it doesn't have to be through the copy button. It should also be possible to copy using the Ctrl+C shortcut or by behaving like a regular terminal where we can copy by just using right-click.