feat: Implement Circuit Breaker Pattern for Emergency Pause and Safety

[Jagadeeshftw]

Current State

No circuit breaker mechanism exists in the contract. There's no way to pause contract operations in emergencies or abnormal conditions, which poses significant safety risks.

What's Missing

• Emergency pause functionality
• Automatic circuit breaker triggers
• Circuit breaker events and notifications
• Circuit breaker recovery mechanisms
• Circuit breaker testing and validation

Implementation Details

• CircuitBreaker Struct: Core circuit breaker logic with state management
• Emergency Pause: Admin-controlled emergency pause functionality
• Automatic Triggers: Automatic circuit breaker activation based on conditions
• Recovery Mechanisms: Manual and automatic recovery from circuit breaker states
• Event System: Comprehensive event emission for circuit breaker state changes
• Testing Framework: Extensive test coverage for all circuit breaker scenarios

Key Features

• Three States: Closed (normal), Open (paused), Half-Open (testing recovery)
• Admin Controls: Secure admin-only emergency pause and recovery
• Automatic Detection: Triggers based on error rates, failure counts, and timeouts
• Event Logging: Complete audit trail of circuit breaker state changes
• Recovery Logic: Intelligent recovery mechanisms with success/failure tracking

Expected Outcome

• Emergency pause functionality for safety
• Automatic circuit breaker triggers
• Circuit breaker events and notifications
• Circuit breaker recovery mechanisms
• Circuit breaker testing and validation

Priority: Low

Labels: circuit-breaker, safety, emergency

Closes #92

[Jagadeeshftw]

@greatest0fallt1me This Pr should be good to go

[greatest0fallt1me]

Thanks for the PR, changes looks good to me