Prepare for Python 3.14

[kddubey]

• fix Tests fail on Python 3.14b1 #163. tested locally on

   Python 3.14.0b3 (v3.14.0b3:26d485d1225, Jun 17 2025, 12:48:06) [Clang 16.0.0 (clang-1600.0.26.6)] on darwin
  

• fix strange bug where, sometime after python 3.13.0, inspect.signature(PydanticV1Dataclass) includes self as the first parameter
• add black formatting to dev setup
• replace pydantic v1 check w/ simpler one that doesn't require the packaging dependency
• move demos to demos/

note: i don't think we can add python 3.14 to the test matrix b/c installing pydantic currently doesn't work in 3.14

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.61%. Comparing base (619ee8b) to head (34f9d27).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
+ Coverage   94.59%   94.61%   +0.01%     
==========================================
  Files           4        4              
  Lines         722      724       +2     
==========================================
+ Hits          683      685       +2     
  Misses         39       39              

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[martinjm97]

Thank you again @kddubey! Kyle and I have been under water with life and research! Thank you for keeping the Tap running!