Guarin lig 3049 add benchmarking tests

[guarin]

Changes

• Move test_benchmarking.py to benchmarking/test_benchmark_module.py
• Add benchmarking/test_knn.py
• Cleanup dimensions in knn_predict docstring/comments.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (950fec3) 88.24% compared to head (da975a6) 88.24%.

Additional details and impacted files

@@                                   Coverage Diff                                   @@
##           guarin-lig-3049-add-simclr-imagenet-resnet50-benchmark    #1165   +/-   ##
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  Coverage                                                   88.24%   88.24%           
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  Files                                                         139      139           
  Lines                                                        5774     5774           
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  Hits                                                         5095     5095           
  Misses                                                        679      679           

Impacted Files	Coverage Δ
lightly/utils/benchmarking/knn.py	100.00% <ø> (ø)

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[huan-lightly-0]

Looks okay. What does test_knn actually test?

[guarin]

Looks okay. What does test_knn actually test?

It tests if the knn matching works correctly and the correct predicted_classes are returned.