Added cross_bucket download to Dataset.download()

[MFSY]

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[codecov-commenter]

Codecov Report

Merging #147 (86bb75a) into master (e80795f) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master     #147   +/-   ##
=======================================
  Coverage   72.05%   72.05%           
=======================================
  Files          78       78           
  Lines        4720     4720           
=======================================
  Hits         3401     3401           
  Misses       1319     1319           

Impacted Files	Coverage Δ
kgforge/specializations/resources/datasets.py	66.66% <50.00%> (ø)

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