Add batch API call to the core module

[tkrs]

This PR partially resolves #7

[codecov]

Codecov Report

Merging #100 into master will increase coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
+ Coverage    90.8%   90.94%   +0.13%     
==========================================
  Files          20       20              
  Lines         261      265       +4     
  Branches       13       13              
==========================================
+ Hits          237      241       +4     
  Misses         24       24

Impacted Files	Coverage Δ
modules/core/src/main/scala/orcus/table.scala	100% <100%> (ø)	⬆️

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