Add "Copy login url" option

[kostasb]

The Login button opens the system's default browser.

As an end user, I may prefer to log in to app.xata.io using a browser or session that isn't my default browser.

In order to do that, I would have to go to the default browser session that was started by the vscode extension, and copy the create API key URL from there, then paste it to the browser session of my preference. A "Copy login url" option, or simply making the existing Login button right-clickable to allow copying its url content, would help address this.