Minor bug fix: neuralGAM v2.0.0 not properly exporting S3 methods

[inesortega]

Fix S3 method dispatch so predict.neuralGAM() and autoplot.neuralGAM() work as expected. This version fixes a minor bug which caused S3 methods to don't be properly exported.

predict.neuralGAM and autoplot.neuralGAM are now properly exported, while keeping the S3 registrations.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 77.04%. Comparing base (1408d45) to head (c56c19c).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
R/NeuralGAM.R	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   76.60%   77.04%   +0.44%     
==========================================
  Files          19       19              
  Lines        1577     1699     +122     
==========================================
+ Hits         1208     1309     +101     
- Misses        369      390      +21     

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