feat: added parameters named in parameters function

[Gmin2]

Added parameters names in function signatures

Part of #1041

Some examples

{
      "label": "fill",
      "kind": 3,
      "detail": "fill(r, g, b, a)",
      "insertText": "fill($1)",
      "insertTextFormat": 2
}

{
      "label": "background",
      "kind": 3,
      "detail": "background(x, y, width, height)",
      "insertText": "background($1)",
      "insertTextFormat": 2
}

    {
      "label": "copy",
      "kind": 3,
      "detail": "copy(sx, sy, sw, sh, dx, dy, dw, dh)",
      "insertText": "copy($1)",
      "insertTextFormat": 2
    }

[Stefterv]

Hi @Gmin2 Thank you for your efforts on this!

We will need something that will figure out the parameters from core instead of a pre-defined list. In this case we would have to maintain the parameter definitions in the future and those might get out of sync over time.

[Stefterv]

This information should be gathered dynamically, not with a pre-defined list