Configuration to increase the terminal cursor width

There is an option called editor.cursorWidth which can be used to increase the cursor width; however, this doesn't change the terminal emulator's cursor width. This is slightly annoying. For example, please see my screenshot:

[Tyriar]

This option was added upstream in xtermjs/xterm.js#2590 as cursorWidth, we should carry it over to vscode (xterm in vscode will get updated to have this option very soon).

[BuraChuhadar]

Sending an MR for this: #87911. While adding this feature in I couldn't find the changes under 4.3.0 xterm release: https://github.com/xtermjs/xterm.js/blob/4.3.0/typings/xterm.d.ts. If you can upgrade the package.json of VSCode then this MR will start working. I tested with the latest beta release of xterm as 4.3.0 is missing this feature.