Create DTO generator for TypeScript

[evidolob]

Description

During work on #11306 we discovered that we need to have some Che DTO object description. Currently we have some TypeScript file generated by https://github.com/eclipse/che/blob/master/dockerfiles/lib/build.sh#L35 , but it's not wryly fit our needs. For TypeScript it's mach better to have:

export interface WorkspaceDto {
    id?: string;
    config: WorkspaceConfig;
    status: string | WorkspaceStatus;
    namespace?: string;
    temporary?: boolean;
    attributes?: WorkspaceAttributes;
    runtime?: Runtime;
    links?: { [attrName: string]: string };
}

instead of:

export module org.eclipse.che.api.workspace.shared.dto {

  export interface WorkspaceDto {
      setConfig(arg0): void;
      setId(arg0): void;
      getConfig(): org.eclipse.che.api.workspace.shared.dto.WorkspaceConfigDto;
      setStatus(arg0): void;
      withAttributes(arg0): org.eclipse.che.api.workspace.shared.dto.WorkspaceDto;
      getLinks(): Map<string,string>;
      setLinks(arg0): void;
      setAttributes(arg0): void;
      withLinks(arg0): org.eclipse.che.api.workspace.shared.dto.WorkspaceDto;
      withId(arg0): org.eclipse.che.api.workspace.shared.dto.WorkspaceDto;
      withStatus(arg0): org.eclipse.che.api.workspace.shared.dto.WorkspaceDto;
      withConfig(arg0): org.eclipse.che.api.workspace.shared.dto.WorkspaceDto;
      setTemporary(arg0): void;
      withTemporary(arg0): org.eclipse.che.api.workspace.shared.dto.WorkspaceDto;
      setRuntime(arg0): void;
      withRuntime(arg0): org.eclipse.che.api.workspace.shared.dto.WorkspaceDto;
      setNamespace(arg0): void;
      withNamespace(arg0): org.eclipse.che.api.workspace.shared.dto.WorkspaceDto;
      getRuntime(): org.eclipse.che.api.workspace.shared.dto.RuntimeDto;
      getNamespace(): string;
      getStatus(): string;
      isTemporary(): boolean;
      getId(): string;
      getAttributes(): Map<string,string>;

  toJson() : any;
  } 
}