feat: Optimize completion range field

[Ricbet]

improve #71060

The ISuggestDataDto should also be able to compress the range field？

{
  startLineNumber: 1,
  startColumn: 2,
  endLineNumber: 3,  -- convert -> [1,2,3,4]
  endColumn: 4,
}

[ghost]

All CLA requirements met.

[jrieken]

Thanks so far.

Did you, by any chance, do some measurements about how much this improves receiving large IntelliSense data? Also, a further improvement would be not send the range when an items range is the default value (e.g the range that's computed on the renderer already). Further geek-out would be have the array as [startColumn, endColumn, startLine, (optional) endLine] and leave the endLine out if it's the same as the startLine (which is almost always is)