DEP: Make scipy an optional dependency

[snowman2]

• Closes REF: Make scipy optional #413
• Tests added
• Fully documented, including docs/history.rst for all changes and docs/rioxarray.rst for new API

[codecov]

Codecov Report

Merging #416 (fd9af26) into master (4c3fd05) will increase coverage by 0.20%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #416      +/-   ##
==========================================
+ Coverage   95.87%   96.08%   +0.20%     
==========================================
  Files          13       13              
  Lines        1528     1531       +3     
==========================================
+ Hits         1465     1471       +6     
+ Misses         63       60       -3     

Impacted Files	Coverage Δ
rioxarray/raster_dataset.py	100.00% <ø> (ø)
rioxarray/raster_array.py	98.32% <100.00%> (+0.01%)	⬆️
rioxarray/_show_versions.py	95.00% <0.00%> (+7.50%)	⬆️

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