feat: can write datetime as time column for csv files

[tsutterley]

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[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (727f1af) 70.20% compared to head (f09ce22) 70.23%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #252      +/-   ##
==========================================
+ Coverage   70.20%   70.23%   +0.03%     
==========================================
  Files          43       43              
  Lines        8987     8994       +7     
  Branches     1182     1180       -2     
==========================================
+ Hits         6309     6317       +8     
+ Misses       2326     2325       -1     
  Partials      352      352              

Flag	Coverage Δ
unittests	70.23% <54.05%> (+0.03%)	⬆️

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Files	Coverage Δ
pyTMD/io/FES.py	46.02% <ø> (ø)
pyTMD/io/GOT.py	64.63% <ø> (ø)
pyTMD/constants.py	48.12% <50.00%> (+0.02%)	⬆️
pyTMD/time.py	70.92% <50.00%> (-0.08%)	⬇️
pyTMD/io/OTIS.py	37.25% <0.00%> (ø)
pyTMD/spatial.py	72.28% <75.00%> (+0.16%)	⬆️
pyTMD/io/ATLAS.py	41.78% <47.36%> (+0.58%)	⬆️

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