Ability to copy a discount

[samgooch]

Is your feature request related to a problem? Please describe.
Some discounts can be timely to create, especially with restricting them to certain product variants. It would be good to have the ability to copy a discount code to then edit the name and code accordingly.

Describe the solution you'd like
A context menu item to copy/duplicate a code.

Describe alternatives you've considered
Creating some custom code but it's better to be included as part of the core product.

Additional context
N/A