fix: Mapped datetime values are now typed as date-time strings in the schema message

[gregkoutsimp]

When generating a datetime value from a string using stream map functionality, the detected schema type for the value falls back to string.

In this implementation we extend _eval_type method of class CustomStreamMap from the mapper.py to be bale to process dates and datetimes data types in stream maps.

Closes #1695

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📚 Documentation preview 📚: https://meltano-sdk--2665.org.readthedocs.build/en/2665/

[codspeed-hq]

CodSpeed Performance Report

Merging #2665 will not alter performance

_{Comparing gregkoutsimp:1695_bug_fix_datetype_stream_maps (3281177) with main (6b3869d)}

Summary

✅ 6 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.86%. Comparing base (6b3869d) to head (3281177).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2665      +/-   ##
==========================================
+ Coverage   89.82%   89.86%   +0.04%     
==========================================
  Files          58       58              
  Lines        4886     4886              
  Branches      960      960              
==========================================
+ Hits         4389     4391       +2     
+ Misses        346      344       -2     
  Partials      151      151              

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[edgarrmondragon]

Thanks @gregkoutsimp!