Lightweight APIs to analyze Java projects just with it's Symbol Table

[rahlk]

Motivation and Context

This PR adds implementations for all APIs that can be invoked solely using the Java symbol_table, without requiring a full Java AST or deeper code analysis. This supports faster, lightweight operations when full parsing is unnecessary, improves performance for metadata-only use cases, and allows greater flexibility in constrained environments.

How Has This Been Tested?

Tested with a comprehensive set of unit tests that accompany every new API that is added.

Coverage reports are generated with a GitHub Action and are tracked with Coveralls to ensure that the new functionality is properly exercised.

Breaking Changes

There have been a few breaking changes. However, since this is a pre-alpha release, these are not critical and are expected as the APIs stabilize. Migration notes are minimal and primarily affect internal interfaces not exposed publicly.

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](https://codellm-devkit.info)
• 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

N/A