Add CompletionItemKind.Folder (#17438)

* Add CompletionItemKind.Folder

Fixes #17435

Adds a new completion item kind for folder/directories. This is useful for path intellisense

For the icons, I copied the icons for folders into the suggestion icon set. Let me know if new ones are needed instead.

* Fix monaco.d.ts

src/vs/workbench/api/node/extHostTypeConverters.ts

@@ -257,6 +257,7 @@ export const CompletionItemKind = {
 			case types.CompletionItemKind.Color: return 'color';
 			case types.CompletionItemKind.File: return 'file';
 			case types.CompletionItemKind.Reference: return 'reference';
+			case types.CompletionItemKind.Folder: return 'folder';
 		}
 		return 'property';
 	},

src/vs/workbench/api/node/extHostTypes.ts

@@ -830,7 +830,8 @@ export enum CompletionItemKind {
 	Snippet = 14,
 	Color = 15,
 	File = 16,
-	Reference = 17
+	Reference = 17,
+	Folder = 18
 }
 
 export class CompletionItem {