fix(list): export IListResult so declaration emit can name it

`index.ts#list` returns it from an exported class, and tsconfig has
`declaration: true`, so tsc needs the type to be nameable:
TS4053 "Return type of public method from exported class has or is using
name 'IListResult' ... but cannot be named".

Author: rsonghuster

src/subCommands/list/index.ts

@@ -12,7 +12,7 @@ import {
   tableShow,
 } from '../../utils';
 
-interface IListResult {
+export interface IListResult {
   functions?: unknown[];
   nextToken?: string;
 }