Use structlog.configure instead of configure_once

[Dref360]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce

Some advices:

• Please don't use custom data or custom paths.
• Use random arrays or even np.ones, np.zeros.
• The example should run with BaaL (and deps) alone.
• Should be Python3 compatible.
• Should not be OS specific.
• The file should reproduce the bug with *high fidelity.
• Link to a gist would be appreciated.

Expected behavior
A clear and concise description of what you expected to happen.

Vesion (please complete the following information):

• OS:
• Python:
• BaaL version:

Additional context
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