Plugin: query permalinks

I see #7 and https://github.com/graphql/graphiql/issues/961 and both reference this functionality but it isn't clear if there should be a UI element to do this, out of the box.

Can we get a UI element added to "Share Query" or "Copy link to query" etc.?

I don't see any type of UI element to share a link in https://developer.github.com/v4/explorer/.

I also want to suggest that the history items when clicking the "history" button allow for a right click "copy link". This seems like a good place to put this.