[CLI] Shorthand notation to instantiate models

[carmocca]

What does this PR do?

Part of #7250

See docs changes for more context

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

None

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[tchaton]

LGMT ! Really excited about this feature !

[ethanwharris]

LGTM 😃

[tchaton]

LGTM !

[codecov]

Codecov Report

Merging #9588 (e9ce94f) into master (e64f358) will decrease coverage by 4%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #9588    +/-   ##
=======================================
- Coverage      93%     89%    -4%     
=======================================
  Files         179     179            
  Lines       15317   15321     +4     
=======================================
- Hits        14209   13594   -615     
- Misses       1108    1727   +619