Support configuring anti-aliasing on renderer

[Tyriar]

VS Code has a mac-specific feature that allows configuring of anti-aliasing on rendered text, this is because macOS by default disabled anti-aliasing so when you plug a macbook into a regular dpi monitor is looks all choppy and awful. Additionally sub-pixel anti-aliasing can look bad on retina displays.

VS Code issue: https://github.com/microsoft/vscode/issues/36249

[JeffreyCA]

Disabling anti-aliasing on the canvas element does not seem straightforward.

For the DOM renderer we might be able to use the -webkit-font-smoothing property.

[Tyriar]

I believe for canvas it's as easy as making the canvas that the character are drawn to be set to transparent.

[jukrb0x]

terminal font antialiasing is still not working on today's vscode, sad tho.

[cyraid]

Poke ..?