Sentinel-1 GRD Analysis Mode

[konstntokas]

• Add support for Sentinel-1 GRD analysis mode.
• Updated year in the headers.

Note: the notebook sentinel_1_analysis.ipynb in folder docs and examples is the same.

I think it might help to start with reading the changes in docs, to get a rough overview of the Sen1 processing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
xarray_eopf/__init__.py	100.00% <ø> (ø)
xarray_eopf/amode.py	100.00% <100.00%> (ø)
xarray_eopf/amodes/__init__.py	100.00% <ø> (ø)
xarray_eopf/amodes/sentinel1.py	100.00% <100.00%> (ø)
xarray_eopf/amodes/sentinel2.py	100.00% <100.00%> (ø)
xarray_eopf/amodes/sentinel3.py	100.00% <100.00%> (ø)
xarray_eopf/backend.py	100.00% <ø> (ø)
xarray_eopf/constants.py	100.00% <100.00%> (ø)
xarray_eopf/filter.py	100.00% <ø> (ø)
xarray_eopf/flatten.py	100.00% <ø> (ø)
... and 4 more

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