ENH: Added band_as_variable option to open_rasterio

[snowman2]

• Closes ENH: Add ability to load bands as data_vars #296
• Closes Store band specific attributes in coordinates #81
• Tests added
• Fully documented, including docs/history.rst for all changes and docs/rioxarray.rst for new API

[codecov]

Codecov Report

Base: 96.16% // Head: 96.33% // Increases project coverage by +0.17% 🎉

Coverage data is based on head (6dc872c) compared to base (104608b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #600      +/-   ##
==========================================
+ Coverage   96.16%   96.33%   +0.17%     
==========================================
  Files          11       11              
  Lines        1641     1691      +50     
==========================================
+ Hits         1578     1629      +51     
+ Misses         63       62       -1     

Impacted Files	Coverage Δ
rioxarray/_io.py	96.44% <100.00%> (+0.60%)	⬆️

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[snowman2]

Thanks @clausmichele @justingruca 👍