ENH: add POC of a cover marker

[theroggy]

First, very rough version...

[codecov]

Codecov Report

Attention: Patch coverage is 7.86026% with 211 lines in your changes missing coverage. Please review.

Project coverage is 25.18%. Comparing base (1424cbf) to head (e02462e).

Files with missing lines	Patch %	Lines
cropclassification/calc_cover.py	0.00%	165 Missing ⚠️
cropclassification/helpers/pandas_helper.py	8.57%	32 Missing ⚠️
cropclassification/preprocess/timeseries.py	0.00%	9 Missing ⚠️
cropclassification/taskrunner.py	33.33%	2 Missing ⚠️
cropclassification/util/raster_index_util.py	33.33%	2 Missing ⚠️
cropclassification/util/mosaic_util.py	92.85%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (1424cbf) and HEAD (e02462e). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (1424cbf)	HEAD (e02462e)
	7	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #168       +/-   ##
===========================================
- Coverage   63.78%   25.18%   -38.61%     
===========================================
  Files          36       37        +1     
  Lines        4664     4856      +192     
===========================================
- Hits         2975     1223     -1752     
- Misses       1689     3633     +1944     

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