feat: add bridge E2E latency measurement with updated consensus config

[ByteYue]

Description

feat: add bridge E2E latency measurement with updated consensus config

• Update consensus_config across all test clusters (bridge, four_validator, fuzzy_cluster, single_node) to use proper on-chain consensus configuration
• Add per-event latency measurement from source chain MessageSent to Gravity chain NativeMinted events
• Enhance BridgeStats with median and P95 latency metrics
• Add query_message_sent_timestamps() helper to fetch source chain event timestamps
• Optimize block timestamp fetching with batch queries

How Has This Been Tested?

Key Areas to Review

Type of Change

• New feature
• Bug fix
• Breaking change
• Performance improvement
• Refactoring
• Dependency update
• Documentation update
• Tests

Which Components or Systems Does This Change Impact?

• Validator Node
• Consensus
• EVM Runtime
• Gravity SDK Core
• CLI Tools
• E2E Tests
• Documentation
• Other (specify)

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes