fix: check if struct implements interface SchemaProvider after deref

[lennycampino]

Problem:
Currently the Schema(r Registry) *Schema on types that implement a custom schema will only be called if the field is not a pointer.

Solution:
In the function SchemaFromType we first deref the type so that we always compare a non pointer type against the interface.

fixes: #412

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.65%. Comparing base (dcfa3e9) to head (4ee4554).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #413   +/-   ##
=======================================
  Coverage   92.65%   92.65%           
=======================================
  Files          21       21           
  Lines        3539     3539           
=======================================
  Hits         3279     3279           
  Misses        221      221           
  Partials       39       39           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[danielgtaylor]

@lennycampino nice fix, thank you! 👍