Create a playground for aws-sdk-js-codemod

### Is your feature request related to a problem? Please describe.
To test `aws-sdk-js-codemod` the users have to install it using `npm install` or `npx`

### Describe the solution you'd like
Create a playground where users can select template, provide their code and check the output.

### Additional context
vue-codemod playground https://github.com/vuejs/vue-codemod/pull/2

No files, tests, or entry points are named in the issue. Start by reviewing the repository structure and the linked vue-codemod playground PR to determine the integration boundary; done means users can select a template, enter code, and inspect transformed output.

Written by the indexing model from the issue text.