feat: add debug capabilities

[Convly]

What does it do?

• adds a dependency to the npm debug package (54kB) and supports-color (10kB)
• introduce debug logs for critical parts of the SDK lifecycle (initialization, validation, http client, auth, content-type managers)

Also

• fix repo configuration around lint, tests and pre-commit scripts

Why is it needed?

Better traceability and maintainability of the codebase.

Easier issue management/reproduction with finegrained logs

How to test it?

DEBUG=* node main.js # debug everything
DEBUG=sdk:auth:* node main.js # debug every auth module
DEBUG=sdj:ct:* node main.js # debug content type managers
DEBUG=*,-sdk:validators:* node main.js # debug everything except validators

TODO

• add documentation

[innerdvations]

Nice! I didn't test it out, but code lgtm.

[innerdvations]

Do we need this? Could we instead have a setHeader(key, value)?

[Convly]

Where would the log originate from? RequestHelper.setHeader(req, name, value) or from the http client when it calls it?

Let's continue the discussion and possibly add this in a later PR