### What is this PR for?
If we want to access databases in a spark interpreter, we need to specify our own private username and password in a spark interpreter paragraph, which is not always safe due to visible authentifier information.
### How should this be tested?
* Create a new spark interpreter paragraph
* use userCredentials.get("your entity").get("username") to get username
* user userCredentials.get("your entity").get("password") to get password
* Does this needs documentation?
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