feat: export imageCollection to xarray datasets

[12rambau]

related to google/Xee#83

Here we add the xee dataset extention to geetools. It will allow users to automatically transfer their ImageCollection to xarray.Dataset.

We followed @alxmrs suggestion to not extend Image. User will need to transfer their images to an ImageCollection or force cast them using ee.imageCollection([image]) before transfering. It ensures consistency.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ce5a1f0) 36.47% compared to head (a56786f) 36.78%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
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+ Coverage   36.47%   36.78%   +0.30%     
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  Files          52       52              
  Lines        2925     2939      +14     
  Branches      296      296              
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+ Hits         1067     1081      +14     
  Misses       1853     1853              
  Partials        5        5              

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