Do not use root logger

[lachesis]

Calling logging.info() at module level with no logger configured triggers logging.basicConfig() automatically (Python's "last resort" behavior) — which creates a StreamHandler on root with WARNING level.

This poisons logging config for anything downstream of this.

Instead, create a logger scoped to doctr package.

Example repro script:

#!/usr/bin/env python
from doctr.io import Document

import logging
logging.basicConfig(level=logging.INFO)

logging.info("I do not see this")
logging.warning("I still see this")

Output:

WARNING:root:I still see this

Expected:

INFO:root:I do not see this
WARNING:root:I still see this

Replaces #2076

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.96%. Comparing base (9c1c6e3) to head (5923734).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2082      +/-   ##
==========================================
+ Coverage   96.94%   96.96%   +0.01%     
==========================================
  Files         156      156              
  Lines        7535     7535              
==========================================
+ Hits         7305     7306       +1     
+ Misses        230      229       -1     

Flag	Coverage Δ
unittests	96.96% <100.00%> (+0.01%)	⬆️

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