[ENH] GEO Datasets: Move GDSInfo initialization in a worker thread

[ales-erjavec]

Issue

GEO Datasets blocks the main thread when first placed on the canvas when it has to download the GDSInfo

Work on top of gh-318

Description of changes

Move the GDSInfo initialization in a worker thread.

Includes

• Code changes
• Tests
• Documentation

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.50000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 48.58%. Comparing base (b2f9763) to head (1184d2b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
+ Coverage   48.47%   48.58%   +0.11%     
==========================================
  Files          67       67              
  Lines       10894    10908      +14     
==========================================
+ Hits         5281     5300      +19     
+ Misses       5613     5608       -5     

Files	Coverage Δ
...ngecontrib/bioinformatics/widgets/OWGEODatasets.py	83.93% <87.50%> (+2.49%)	⬆️

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