[Feature]: Provide debug mode

[trivikr]

Self-service

• I'd be willing to implement this feature

Problem

The only debugging which aws-sdk-js-codemod uses is the one provided by JSCodeShift.

There's no additional debug option available, which can provide information on what transformation was done.

Solution

Add a CLI option (say --debug) to add debug mode.

Alternatives

N/A

Additional context

Tip from CLI best practices: https://github.com/lirantal/nodejs-cli-apps-best-practices#63-provide-debug-mode