Remove import of internal package

[anishathalye]

This import made cleanlab.internal.util available as cleanlab.util, which we don't want.

[codecov]

Codecov Report

Merging #195 (6326521) into master (2e9a1e2) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 6326521 differs from pull request most recent head 470ffb0. Consider uploading reports for the commit 470ffb0 to get more accurate results

@@            Coverage Diff             @@
##           master     #195      +/-   ##
==========================================
- Coverage   95.69%   95.68%   -0.02%     
==========================================
  Files          11       10       -1     
  Lines         813      811       -2     
  Branches      175      175              
==========================================
- Hits          778      776       -2     
  Misses         12       12              
  Partials       23       23              

Impacted Files	Coverage Δ
cleanlab/__init__.py	100.00% <ø> (ø)
cleanlab/benchmarking/__init__.py
cleanlab/benchmarking/noise_generation.py
cleanlab/noise_generation.py	97.20% <0.00%> (ø)

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[jwmueller]

Good catch!