Feature/data array save

[tomalrussell]

Merge after #322

This contains small speed/size improvements arising from nismod/nismod2#60:

• Faster comparison of dim names using python set
• Smaller parquet files using gzip compression

[codecov[bot]]

Codecov Report

Merging #323 into master will increase coverage by 0.05%. The diff coverage is 95.23%.

@@            Coverage Diff             @@
##           master     #323      +/-   ##
==========================================
+ Coverage   69.75%   69.81%   +0.05%     
==========================================
  Files          59       59              
  Lines        5045     5055      +10     
  Branches      605      605              
==========================================
+ Hits         3519     3529      +10     
  Misses       1431     1431              
  Partials       95       95

Flag	Coverage Δ
#javascript	69.81% <95.23%> (+0.05%)	:arrow_up:
#python	77.79% <95.23%> (+0.05%)	:arrow_up:

Impacted Files	Coverage Δ
src/smif/data_layer/file/file_data_store.py	86.85% <100%> (ø)	:arrow_up:
src/smif/metadata/spec.py	99.1% <100%> (+0.01%)	:arrow_up:
src/smif/data_layer/data_handle.py	83.05% <100%> (+0.44%)	:arrow_up:
src/smif/data_layer/data_array.py	83.87% <85.71%> (+0.26%)	:arrow_up:

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[willu47]

Should this merge into master or onto a develop branch ready for next release?