Figure out how to encode sortText (because it means TypeScript deprecated completions show up first)

[DanielRosenwasser]

Try requesting completions in a blank file.

I think this is because our SortText uses numeric text, but the text is sorted as a string. Why would that matter? Well, global deprecated completions have a numeric value of 13, which is less than almost any other completion entry type.

Editors just do a basic string comparison of sortTexts, so we should figure out how to fix this.

[andrewbranch]

We’ll need an entirely new scheme if we want to do #41083, which I plan on looking at for 4.5.