Update core logic files

[zinodict121]

Pull Request: Update Core Logic Files (Resolves #149)

Description

This PR introduces updates and new features to the core logic modules to resolve Issue #149. It implements core data structures and logic for slashing evidence verification, penalty calculations, validator balance tracking, job scheduling, and updates the database cache configuration.

Changes Included

• src/db/mod.rs: Added new modules for database and caching layers for consensus state (committee_cache, migrations, cache).
• src/job_scheduler/mod.rs: Updated the job scheduling logic.
• src/slashing/evidence_verifier.rs: Implemented logic for slashing evidence verification, including slot bounds checking and expiry logic (verify_evidence_expiry, verify_surround_vote).
• src/slashing/penalty_calculator.rs: Implemented penalty calculation functions.
• src/validator/balance_tracker.rs: Implemented the balance tracker logic for validator staking and penalties.

Testing

• Unit tests have been added to the respective modules to ensure correct behavior (e.g., in evidence_verifier.rs).
• All tests pass successfully.

Related Issues

• Resolves Fix Failing Core Tests #149

Notes for Reviewers

Please review the bounds calculations in evidence_verifier.rs specifically to ensure they align with the expected slot/epoch timing requirements.