feat: Add inheritance support to Java call graph generation using symbol table

[sinha108]

Motivation and Context

Previously, the Java call graph generation using symbol tables only detected methods declared directly in the receiver type's class. When a method was inherited from a parent class, it would not appear in the call graph, leading to incomplete analysis.

This change enhances JCodeanalyzer to recursively search the class hierarchy to find inherited method definitions. This ensures that the call graph contains edges for method calls on inherited methods.

How Has This Been Tested?

Created 8 tests in test_inheritance_call_graph.py covering single-level inheritance, concrete vs interface resolution,
and multi-level inheritance with parameters targeting JCodeanalyzer methods get_class_call_graph_using_symbol_table(), get_callees(), and get_callers().

Breaking Changes

This is a backward-compatible enhancement.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the Codellm-Devkit Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

Interface methods without concrete implementations are not considered during the search.