Implement Terminal Link Handler

[hediet]

Very often, the terminal is used to spawn a dev http server (nextjs and webpack do this):

It would be nice if the edge webview would open when clicking on the url.
Extensions can override the link click behavior by using registerTerminalLinkProvider.
However, I suggest to not do this by default, until microsoft/vscode#200579 lands: Rather, VS Code should ask the user if they want to use the OS browser or edge dev tools or the simple browser that ships with VS Code.

For now, the extension could add a setting that would control if it registers a terminal link provider.
This optional feature would then push us to implement microsoft/vscode#200579.

[captainbrosset]

Thanks for the suggestion!