Masks secrets in traces.

[willi-mueller]

Description

Related Issues

• Fixes #1687

Note

• Instead of an empty string, which was requested in the issue, I implemented "*****" so that it looks similar to the rest_api source where we also mask secrets

TODO before merging

• [x] Test trace.asstr(verbosity=1) which is called by the dlt pipeline -v trace command
• [ ] Decide whether we want identical masking logic for the rest_api source and the traces. The rest_api source shows the first and last character if the secret is at least 4 characters long. The traces show always "*****"
• [ ] Agree on where to implement the unified secret masking logic or at least the constant MASKED_SECRET="*****" so that we can use it in both dlt/sources/rest_api/__init__.py as well as dlt/pipeline/trace.py

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