message: refactor(language-service): remove unused interfaces
  not used in stylable-intelligence as well
diff: import ts from 'typescript';
  -import {
  - Command,
  - CompletionItem,
  - Diagnostic,
  - Location,
  - NotificationType,
  - ParameterInformation,
  - Position,
  - Range,
  - TextEdit,
  -} from 'vscode-languageserver';
  -import { ColorPresentationRequest, DocumentColorRequest } from 'vscode-languageserver-protocol';
  -
  -export interface NotificationTypes {
  - // TODO: remove me?
  - openDoc: NotificationType<string, void>;
  - colorRequest: typeof DocumentColorRequest;
  - colorPresentationRequest: typeof ColorPresentationRequest;
  -}
  -
  -export interface LSPTypeHelpers {
  - // TODO: remove me?
  - CompletionItem: typeof CompletionItem;
  - TextEdit: typeof TextEdit;
  - Location: typeof Location;
  - Range: typeof Range;
  - Position: typeof Position;
  - Command: typeof Command;
  - ParameterInformation: typeof ParameterInformation;
  - Diagnostic: typeof Diagnostic;
  -}
  export interface ExtendedTsLanguageService {
  setOpenedFiles: (files: string[]) => void;
  