Support Sentinel-2 access via CDSE STAC API

[konstntokas]

closes #21

[konstntokas]

Some problems arose with the testing strategy using pytest-recodingand s3fs. The unit-testing for open_data of Senitnel-2 data via CDSE STAC API needs to be rethought and will be address in issue #25.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.68%. Comparing base (4ac6ac0) to head (e95b878).
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   98.93%   98.68%   -0.26%     
==========================================
  Files          10       14       +4     
  Lines         659      985     +326     
==========================================
+ Hits          652      972     +320     
- Misses          7       13       +6     

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