Add Postgres DATE_TRUNC function

[BranislavLazic]

Adds the DATE_TRUNC function for Postgres.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.49%. Comparing base (b835e25) to head (dce5fd6).
Report is 3 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #389   +/-   ##
=======================================
  Coverage   90.48%   90.49%           
=======================================
  Files         125      125           
  Lines        7453     7458    +5     
=======================================
+ Hits         6744     6749    +5     
  Misses        550      550           
  Partials      159      159           

Flag	Coverage Δ
	90.49% <100.00%> (?)

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[go-jet]

Thanks. Looks good. 👍