[AL-1349] Add alias for checking if a dataset exists.

[FayazRahman]

🚀 🚀 Pull Request

Checklist:

• My code follows the style guidelines of this project and the Contributing document
• I have commented my code, particularly in hard-to-understand areas
• I have kept the coverage-rate up
• I have performed a self-review of my own code and resolved any problems
• I have checked to ensure there aren't any other open Pull Requests for the same change
• I have described and made corresponding changes to the relevant documentation
• New and existing unit tests pass locally with my changes

Changes

[codecov]

Codecov Report

Merging #1569 (40b949b) into main (536aa88) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1569   +/-   ##
=======================================
  Coverage   92.37%   92.38%           
=======================================
  Files         200      200           
  Lines       17984    17990    +6     
=======================================
+ Hits        16613    16620    +7     
+ Misses       1371     1370    -1     

Flag	Coverage Δ
unittests	92.38% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
hub/__init__.py	94.44% <100.00%> (+0.10%)	⬆️
hub/api/tests/test_api.py	100.00% <100.00%> (ø)
hub/api/dataset.py	91.93% <0.00%> (+0.53%)	⬆️

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