Refactor cli arguments of models

[akihironitta]

What does this PR do?

Changes --data_path to --data_dir which is commonly used in other models.

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[codecov]

Codecov Report

Merging #394 (64cf526) into master (b8ac851) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #394   +/-   ##
=======================================
  Coverage   81.18%   81.18%           
=======================================
  Files         100      100           
  Lines        5714     5714           
=======================================
  Hits         4639     4639           
  Misses       1075     1075           

Flag	Coverage Δ
cpu	24.27% <ø> (ø)
pytest	24.27% <ø> (ø)
unittests	80.46% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../models/self_supervised/simclr/simclr_finetuner.py	100.00% <ø> (ø)
...lts/models/self_supervised/simclr/simclr_module.py	71.49% <ø> (ø)

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