feat: add msgspec support for `--output-datetime-class datetime`

[indrat]

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Adds msgspec support for datetime output with --output-datetime-class datetime

addresses #2078

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (d306553) to head (8d23bbe). Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2124   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           38        38           
  Lines         4250      4258    +8     
  Branches       984       984           
=========================================
+ Hits          4250      4258    +8     

Flag	Coverage Δ
unittests	99.67% <100.00%> (+<0.01%)	:arrow_up:

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #2124 will not alter performance

_{Comparing indrat:2078-msgspec-datetime-support (8d23bbe) with main (d306553)}

Summary

✅ 30 untouched benchmarks