feat: Expose function name node

[abhisek]

No description provided.

[Copilot]

Pull Request Overview

This PR exposes the internal function name node through a new getter method to provide external access to the underlying tree-sitter node representing the function name.

• Adds a new public getter method GetFunctionNameNode() to the FunctionDeclarationNode struct

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.86%. Comparing base (91cb669) to head (20bddbd).

Files with missing lines	Patch %	Lines
core/ast/function_decl.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   57.82%   57.86%   +0.04%     
==========================================
  Files          47       47              
  Lines        4578     4580       +2     
==========================================
+ Hits         2647     2650       +3     
  Misses       1707     1707              
+ Partials      224      223       -1     

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