Feature request: autosuggesting words to speed up typing

[j-lakeman]

Would be nice to have autosuggestion, especially for longer words, where it could save a lot of typing time. It could be triggered either automatically as you type or on pressing ctrl + space.
The autosuggestion provided by https://github.com/valentjn/vscode-ltex is pretty nice, however the native spell checker would be a lot faster and more preferable anyway.