Add API credentials retrieving package about nodejs HOT 2 CLOSED

Some thoughts regarding the expected behaviours

Check environment variables CT_PROJECT_KEY, CT_CLIENT_ID, CT_CLIENT_SECRET.
For single project usage, nice to have so no project name needs to be passed.

I think the reason we moved away from this is because of the risk of using a production project or another project not intented (@PhilippSpo almost fell for this). Less risky if you pass the key you want to use for test when developing

In general, I think we just need something more like what's currently in sphere-node-utils

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@hisabimbola I would be okay with cutting away option two, for more simplicity. I think the point of 'risk' is not a good reason to do so though. Setting these environment variables are the user's own choice, if you work with both development and productions projects you simply do not use them. On the other hand it provides a simpler interface for those with only one project.

Regarding the utils, this is very close to what we have there unless you mean something specifically that's missing? Overall I'd prefer to keep it simpler than the utils.

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