feat: support want_dt with support for datetime+str+int+date

[EspenAlbert]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 85.29412% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 82.55%. Comparing base (5b7f709) to head (eea9a24).

Files	Patch %	Lines
...odel_lib/src/model_lib/serialize/json_serialize.py	17.64%	14 Missing ⚠️
zero_3rdparty/src/zero_3rdparty/datetime_utils.py	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   82.50%   82.55%   +0.05%     
==========================================
  Files          51       51              
  Lines        3452     3537      +85     
==========================================
+ Hits         2848     2920      +72     
- Misses        604      617      +13     

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