Implement Clipboard Button

[VixenKasai]

I'd like to introduce a concept I've dubbed the "Clipboard" Button.

I picture it working similarly to the Current Link button in which you would provide a String of text that would be copied to the users clipboard whenever they clicked it.

I see this being especially useful for quickly copying useful information, especially from embeds on mobile!

As I picture, it would be implemented as a new button type into the existing action row, (again very similar to how link buttons currently work) and upon click, copying a pre-defined String to the users clipboard.

[advaith1]

duplicate of #3374

[banocean]

But it mark it as anwserd when it isn't ( #3374 )