Add GPU_id param for DESC

[johnarevalo]

Without the GPU_id param, DESC method does not use the GPU.

[codecov]

Codecov Report

Merging #372 (07a63d2) into main (2ae3d08) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #372   +/-   ##
=======================================
  Coverage   53.34%   53.34%           
=======================================
  Files          22       22           
  Lines        1854     1854           
=======================================
  Hits          989      989           
  Misses        865      865           

Flag	Coverage Δ
unittests	53.34% <100.00%> (ø)

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Impacted Files	Coverage Δ
scib/integration.py	36.20% <100.00%> (ø)

[LuckyMD]

Looks good to me. Thanks for the PR! We didn't actually test any of the methods on GPU, but this doesn't break the CPU workflow, so all good.