ENG-506 Add performance metrics tracking for key operations

[lionakhnazarov]

• Introduced a new system to monitor various operations within the Keep Core node, including wallet actions, DKG processes, signing operations, coordination procedures, and network activities.
• Metrics are recorded through a new interface, allowing for optional integration without impacting performance when disabled.
• Updated relevant components to wire in metrics recording, ensuring comprehensive coverage of critical operations.
• Added documentation detailing implemented metrics and their usage.

This enhancement provides better visibility into node performance and health, facilitating monitoring and troubleshooting.

Wallet Dispatcher Metrics (6 metrics)

Location: pkg/tbtc/wallet.go

• ✅ performance_wallet_dispatcher_active_actions (gauge)
• ✅ performance_wallet_dispatcher_rejected_total (counter)
• ✅ performance_wallet_actions_total (counter)
• ✅ performance_wallet_action_success_total (counter)
• ✅ performance_wallet_action_failed_total (counter)
• ✅ performance_wallet_action_duration_seconds (histogram)

DKG Operations Metrics (6 metrics)

Location: pkg/tbtc/dkg.go

• ✅ performance_dkg_joined_total (counter)
• ✅ performance_dkg_failed_total (counter)
• ✅ performance_dkg_duration_seconds (histogram)
• ✅ performance_dkg_validation_total (counter)
• ✅ performance_dkg_challenges_submitted_total (counter)
• ✅ performance_dkg_approvals_submitted_total (counter)

Signing Operations Metrics (5 metrics)

Location: pkg/tbtc/signing.go, pkg/tbtc/node.go

• ✅ performance_signing_operations_total (counter)
• ✅ performance_signing_success_total (counter)
• ✅ performance_signing_failed_total (counter)
• ✅ performance_signing_duration_seconds (histogram)
• ✅ performance_signing_timeouts_total (counter)

Coordination Operations Metrics (4 metrics)

Location: pkg/tbtc/coordination.go, pkg/tbtc/node.go

• ✅ performance_coordination_windows_detected_total (counter)
• ✅ performance_coordination_procedures_executed_total (counter)
• ✅ performance_coordination_failed_total (counter)
• ✅ performance_coordination_duration_seconds (histogram)

Network Operations Metrics (10 metrics)

Location: pkg/net/libp2p/libp2p.go, pkg/net/libp2p/channel.go, pkg/net/libp2p/channel_manager.go

• ✅ performance_peer_connections_total (counter)
• ✅ performance_peer_disconnections_total (counter)
• ✅ performance_message_broadcast_total (counter)
• ✅ performance_message_received_total (counter)
• ✅ performance_incoming_message_queue_size (gauge, with channel label)
• ✅ performance_message_handler_queue_size (gauge, with channel and handler labels)
• ✅ performance_ping_test_total (counter)
• ✅ performance_ping_test_success_total (counter)
• ✅ performance_ping_test_failed_total (counter)
• ✅ performance_ping_test_duration_seconds (histogram)