Feature/apache arrow [WIP]

[alexjbush]

Functionality to use the Databricks FileStore and Apache Arrow files instead of embedding JSON.

[codecov-io]

Codecov Report

Merging #8 into master will decrease coverage by 0.26%.
The diff coverage is 93.1%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
- Coverage   93.51%   93.25%   -0.27%     
==========================================
  Files          18       23       +5     
  Lines         216      267      +51     
  Branches       14       16       +2     
==========================================
+ Hits          202      249      +47     
- Misses         14       18       +4

Impacted Files	Coverage Δ
...com/coxautodata/vegalite4s/providers/package.scala	83.33% <ø> (ø)	⬆️
...ite4s/providers/ClasspathJarResourceProvider.scala	92% <ø> (ø)	⬆️
...cala/com/coxautodata/arrow/ArrowOutputWriter.scala	100% <100%> (ø)
...src/main/scala/com/coxautodata/arrow/package.scala	100% <100%> (ø)
...galite4s/spark/filestore/DatabricksFileStore.scala	100% <100%> (ø)
...ala/com/coxautodata/vegalite4s/spark/package.scala	100% <100%> (ø)	⬆️
...odata/vegalite4s/providers/LocalFileProvider.scala	100% <100%> (ø)	⬆️
...todata/vegalite4s/providers/JsdelivrProvider.scala	100% <100%> (ø)	⬆️
...om/coxautodata/arrow/ArrowOutputWriterFactor.scala	100% <100%> (ø)
...in/scala/com/coxautodata/arrow/DefaultSource.scala	75% <75%> (ø)
... and 6 more

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