[WIP] datetime() function

[vkagamlyk]

No description provided.

[codecov]

Codecov Report

Merging #86 (10d9d84) into master (1e3c881) will increase coverage by 0.04%.
Report is 8 commits behind head on master.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #86      +/-   ##
============================================
+ Coverage     75.86%   75.91%   +0.04%     
- Complexity    12737    12796      +59     
============================================
  Files          1060     1062       +2     
  Lines         64353    64538     +185     
  Branches       7110     7133      +23     
============================================
+ Hits          48821    48993     +172     
- Misses        12891    12892       +1     
- Partials       2641     2653      +12     

Files	Coverage Δ
...g/apache/tinkerpop/gremlin/jsr223/CoreImports.java	97.84% <100.00%> (+0.01%)	⬆️
...remlin/language/grammar/GenericLiteralVisitor.java	84.72% <100.00%> (+0.14%)	⬆️
.../apache/tinkerpop/gremlin/util/DatetimeHelper.java	75.67% <100.00%> (+0.67%)	⬆️

... and 14 files with indirect coverage changes

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