Rely on 'vscode.env.openExternal' API instead of 3'd party lib

[azatsarynnyy]

Hello,

I noticed that the open library is used by the extension for opening the URLs externally, in a browser.

Is there a reason why the VS Code's vscode.env.openExternal API isn't used for that? Maybe that API has been added recently?

Would you be interested in such a contribution?
If there's some concern that vscode.env.openExternal API may not work in some cases, then open lib can be used as a fallback option.

[dgolovin]

@azatsarynnyy thank you for the suggestion, it's been part of API for 9 month. I see no reason using open if vscode.env.openExternal works. Will test it and switch to it if it works as expected.