Add a method to PintoMapping to get a callable to invoke an objects builder method

[dpi]

…

Fixes #66

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.08%. Comparing base (3b86448) to head (aabcd10).

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #67      +/-   ##
============================================
+ Coverage     97.06%   97.08%   +0.01%     
- Complexity      245      246       +1     
============================================
  Files            38       38              
  Lines           511      514       +3     
============================================
+ Hits            496      499       +3     
  Misses           15       15              

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