add faraday adapter customization

[apneadiving]

I needed to have a custom adapter (for easy retry purposes basically).
I think it could help other people.

1. Fork the repo and create your branch from master.
   ✅
2. If you've added code that should be tested, add tests.
   ✅
3. If you've changed APIs, update the documentation.
   Not the case
4. Ensure the test suite passes.
   ✅
5. Make sure your code lints.
   ❌ the code has 13334 offenses detected without my changes
6. If you haven't already, complete the Contributor License Agreement ("CLA").
   ✅

[apneadiving]

because it does require faraday which is now needed in config for the default value