Forman 141 optimize

[forman]

Addresses #141. After accepting this, xcube has

1. a new CLI command xcube optimize [OPTIONS] INPUT
2. a new API function xcube.api.optimize_dataset(input_path, ...)

[codecov-io]

Codecov Report

Merging #146 into master will increase coverage by 0.11%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #146      +/-   ##
==========================================
+ Coverage   85.62%   85.74%   +0.11%     
==========================================
  Files          72       75       +3     
  Lines        6743     6799      +56     
==========================================
+ Hits         5774     5830      +56     
  Misses        969      969

Impacted Files	Coverage Δ
xcube/util/optimize.py	100% <100%> (ø)
xcube/api/__init__.py	100% <100%> (ø)	⬆️
xcube/util/unchunk.py	100% <100%> (ø)
xcube/cli/optimize.py	100% <100%> (ø)
xcube/cli/cli.py	91.72% <100%> (+0.12%)	⬆️
xcube/util/dsgrow.py	100% <100%> (ø)	⬆️

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[AliceBalfanz]

Please add the documentation in the README.md, see DevGuide.
Appart from that, the optimize tool works very nicely, thank you for implementing!

[forman]

Please add the documentation in the README.md, see DevGuide

Done!

[AliceBalfanz]

Thanks for adding the README :)