WIP Add support for get_columns_copy interface

[davidanthoff]

No description provided.

[codecov-io]

Codecov Report

Merging #3 into master will decrease coverage by 4.11%.
The diff coverage is 78.94%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
- Coverage   96.96%   92.85%   -4.12%     
==========================================
  Files           1        1              
  Lines          66       70       +4     
==========================================
+ Hits           64       65       +1     
- Misses          2        5       +3

Impacted Files	Coverage Δ
src/TableTraitsUtils.jl	92.85% <78.94%> (-4.12%)	⬇️

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