Fix Issue 113: call graph is missing edges to implementations of interfaces. Merge to v1.X.X.

[rahlk]

We remove entrypoint methods filter so WALA can use every method to build it's call graph thereby enabling package private methods/classes.

Motivation and Context

Call graph edges do not resolve to interface class subtypes or to/from package private methods

How Has This Been Tested?

We added a new test application with a package private method(s) and an integration test to ensure that these methods were indeed present in the call graph.

Breaking Changes

No.

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

For now, we keep RTACallGraphBuilder(...) for speed and scalability.

This should close issue #113.