message: chore(exchange-core-irec): stringify Filter enum
diff: import { IRECProduct } from './IRECProduct';
  export enum Filter {
  - All,
  - Specific,
  - Unspecified
  + All = 'All',
  + Specific = 'Specific',
  + Unspecified = 'Unspecified'
  }
  export class IRECProductFilter extends IRECProduct {
  