[CLI] Shorthand notation to instantiate datamodules

[carmocca]

What does this PR do?

Fixes #7250

Does your PR introduce any breaking changes? If yes, please list them.

None

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[codecov]

Codecov Report

Merging #10011 (5b31406) into master (e0c83ee) will increase coverage by 0%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #10011   +/-   ##
=======================================
  Coverage      93%      93%           
=======================================
  Files         180      180           
  Lines       15877    15882    +5     
=======================================
+ Hits        14698    14703    +5     
  Misses       1179     1179