Feature s2 cloud score

[dugalh]

Features:

• Add Sentinel-2 Cloud Score+ mask method (cloud-score).
• Change default Sentinel-2 masking method to cloud-score.
• Revert to multi-threaded overviews on download.
• Remove lock on calls to ee.Image.getDownloadUrl() for tile download.
• Download tiles as GeoTIFFs rather than zipped GeoTIFFs.
• Simplify pixel grid maintenance when exporting.
• Change image date property to be time zone aware, and update deprecated calls to datetime.utcfromtimestamp().
• Deprecate Sentinel-2 cloud-prob and qa masking methods.

Fixes:

• Correct cast direction for Sentinel-2 cloud-prob and qa shadow masking.
• Provide image scale property in meters for all CRSs.
• Allow export of images with positive y-axis geo-transforms on the source pixel grid.
• Fix resampling for harmonised Sentinel-2 images to use minimum scale projection.

Packaging:

• Update required python version to 3.8.
• Pin Rasterio & earthengine-api versions for multithreaded overviews / ee.Image.getDownloadUrl() calls.

Docs:

• Updates to use harmonised Sentinel-2 images and cloud-score masking.

[codecov]

Codecov Report

Attention: Patch coverage is 93.71728% with 12 lines in your changes missing coverage. Please review.

Project coverage is 90.89%. Comparing base (0f53160) to head (9263be8).
Report is 36 commits behind head on main.

Files with missing lines	Patch %	Lines
geedim/enums.py	66.66%	11 Missing ⚠️
geedim/schema.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
- Coverage   91.73%   90.89%   -0.85%     
==========================================
  Files          13       13              
  Lines        1622     1636      +14     
==========================================
- Hits         1488     1487       -1     
- Misses        134      149      +15     

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