[APP] Adobe Document Services Auth integration

**Name of app / service**
This is less an app and more an Auth option request. I'd like to support Adobe Document Services (https://www.adobe.io/apis/documentcloud/dcsdk/) on Pipedream by adding the ability to add an auth object. Our APIs require 5 values - 4 keys and a private key string.

I can do this now in a code step with env variables, but it would rock to have this as an auth. I could then publish actions/apps related to doc services.

Willing to help write code/test/etc.

**Link to developer documentation**
https://www.adobe.io/apis/documentcloud/dcsdk/docs.html

**Is lack of support preventing you from building workflows, or do you have a workaround?**
I can do it "by hand" with env vars, or even hard coded values in a code step.

**Are there specific actions, or triggers, you'd like to see for this app? Please let us know here or use the Action and Trigger issue templates to open requests for each!**
I'd like to author actions for our services (like Optimize PDF) based on this auth.