#71 feat: add concat_ws

[eruizalo]

No description provided.

[codecov]

Codecov Report

Merging #110 (30f2b1f) into main (67b36ee) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   81.07%   81.31%   +0.23%     
==========================================
  Files          39       39              
  Lines         560      567       +7     
  Branches       10        8       -2     
==========================================
+ Hits          454      461       +7     
  Misses        106      106              

Impacted Files	Coverage Δ
core/src/main/scala/doric/syntax/DateColumns.scala	100.00% <ø> (ø)
...re/src/main/scala/doric/syntax/StringColumns.scala	100.00% <100.00%> (ø)

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