Improve query predicate error handling and add Rust integration tests

[DavidBakerEffendi]

This pull request improves the robustness of query predicate evaluation and expands test coverage for the Rust language bindings.

Key changes include:

• Predicate Validation: Updated TSQueryPredicate to throw an IllegalStateException when source bytes are missing or invalid during text-based predicate evaluation (e.g., #eq?, #match?). This replaces silent failures with explicit error reporting.
• Rust Integration Tests: Added new integration tests in TreeSitterRustTest that verify complex query scenarios, including usage of #eq? and #not-eq? predicates on Rust attributes and macro derive names.
• Enhanced Test Suite: Added unit tests in TSQueryPredicateTest to verify that the library correctly handles and reports missing source data.

These changes ensure that developers receive clear feedback when query execution environment is misconfigured.