Added method to serialize DateTimeValues

[joachimmetz]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 97.45763% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.90%. Comparing base (d13752b) to head (27bc4eb).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dfdatetime/time_elements.py	87.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #309      +/-   ##
==========================================
- Coverage   99.12%   98.90%   -0.22%     
==========================================
  Files          24       24              
  Lines        2392     2466      +74     
==========================================
+ Hits         2371     2439      +68     
- Misses         21       27       +6     

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