Add DateColumn

[lrljoe]

This adds a new DateColumn, which can receive either DateTime objects, or strings

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (69a64c3) 89.08% compared to head (868bef0) 89.17%.

:exclamation: Current head 868bef0 differs from pull request most recent head d0c8dd8. Consider uploading reports for the commit d0c8dd8 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1589 +/- ## ============================================= + Coverage 89.08% 89.17% +0.08% - Complexity 1307 1317 +10 ============================================= Files 99 102 +3 Lines 3078 3103 +25 ============================================= + Hits 2742 2767 +25 Misses 336 336 ```

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