[BEHAVIOR] Add ability to choose between DATETIME and TIMESTAMP

[wollanup]

Closes #1971

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (4f36eea) 89.27% compared to head (85745f9) 89.27%.

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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1978   +/-   ##
=========================================
  Coverage     89.27%   89.27%           
- Complexity     8049     8052    +3     
=========================================
  Files           232      232           
  Lines         24519    24521    +2     
=========================================
+ Hits          21889    21891    +2     
  Misses         2630     2630           

Flag	Coverage Δ
5-max	89.27% <100.00%> (+<0.01%)	⬆️
7.4	89.27% <100.00%> (+<0.01%)	⬆️
agnostic	67.47% <100.00%> (+<0.01%)	⬆️
mysql	69.84% <100.00%> (+0.03%)	⬆️
pgsql	69.87% <100.00%> (+0.03%)	⬆️
sqlite	67.81% <100.00%> (+0.01%)	⬆️

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Files Changed	Coverage Δ
...r/Behavior/Timestampable/TimestampableBehavior.php	95.94% <100.00%> (+0.11%)	⬆️

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[wollanup]

Hi @michbeck and @dereuromark !
If you're interested by this PR, could you help me with the tests errors (8.2, pgsql) please ?
I'm not sure to find the cause easily. Maybe a problem saving a book [here] ?(

Propel2/tests/Propel/Tests/Runtime/ActiveQuery/ExistsTest.php

Line 254 in 4f36eea

$this->createBook($author3, 1);

)

Thanks for any help !