feat(contributoor): add events shell + sink(s)

[mattevans]

Progress PR:

• Implements basic sinks (xatu + stdout for debug)
• Adds slim-lined event handler shell/setup (implements Attestation event only for now).
• Handle boot/shutdown gracefully.

More to come:

• Presets
• Wallclock
• Implementation of events.
• Metrics
• Cron/Schedule events // Clarify with Steve/Sammo if needed.
• Telemetry
• Tests
• ... and more

go run ./cmd/sentry/main.go --config /Users/matty/.contributoor/config.yaml --debug true.

INFO[0000] Starting contributoor                               config_path=/Users/matty/.contributoor name=network_name_mainnet_contributoor version=0.0.2
INFO[0000] Batch item processor initialized              batch_timeout=5s export_timeout=30s max_export_batch_size=512 max_queue_size=51200 shipping_method=async workers=5
INFO[0000] Enabling keepalive                            keepalive_time=2m30s keepalive_timeout=30s output_name=network_name_mainnet_contributoor output_type=xatu
INFO[0000] Batch item processor initialized              batch_timeout=5s export_timeout=30s max_export_batch_size=512 max_queue_size=51200 shipping_method=async workers=1
INFO[0000] Starting sink                                 name=network_name_mainnet_contributoor type=stdout
INFO[0000] Starting 5 workers for xatu_output_stdout_network_name_mainnet_contributoor
INFO[0000] Starting sink                                 name=network_name_mainnet_contributoor type=xatu
INFO[0000] Starting 1 workers for xatu_output_xatu_network_name_mainnet_contributoor
INFO[0000] Starting beacon...                            module=consensus/beacon
INFO[0000] Beacon started!                               module=consensus/beacon
INFO[0000] Upstream beacon node is healthy               module=contributoor/ethereum/beacon
INFO[0000] Starting service                              module=contributoor/ethereum/beacon service=metadata
INFO[0000] Waiting for service to be ready               module=contributoor/ethereum/beacon service=metadata
INFO[0000] Detected ethereum network                     id=3151908 module=sentry/ethereum/metadata name=network_name_mainnet_contributoor
INFO[0000] Metadata service is ready                     module=sentry/ethereum/metadata
INFO[0000] Service is ready                              module=contributoor/ethereum/beacon service=metadata
INFO[0000] Starting service                              module=contributoor/ethereum/beacon service=duties
INFO[0000] Starting duties service                       beacon_committees_enabled=true module=sentry/ethereum/duties proposer_duties_enabled=true
INFO[0000] Waiting for service to be ready               module=contributoor/ethereum/beacon service=duties
INFO[0000] Service is ready                              module=contributoor/ethereum/beacon service=duties
INFO[0000] All services are ready                        module=contributoor/ethereum/beacon
INFO[0000] Setting up beacon node event subscriptions    module=contributoor/ethereum/beacon
INFO[0002] Subscribing to events upstream                module=consensus/beacon topics="[attestation block chain_reorg finalized_checkpoint head voluntary_exit contribution_and_proof blob_sidecar]"
INFO[0004] event received                                event_type=BEACON_API_ETH_V1_EVENTS_CONTRIBUTION_AND_PROOF_V2 received_at="2025-01-07T11:56:00+10:00"
INFO[0004] event received                                event_type=BEACON_API_ETH_V1_EVENTS_CONTRIBUTION_AND_PROOF_V2 received_at="2025-01-07T11:56:00+10:00"
INFO[0004] event received                                event_type=BEACON_API_ETH_V1_EVENTS_CONTRIBUTION_AND_PROOF_V2 received_at="2025-01-07T11:56:00+10:00"
INFO[0004] event received                                event_type=BEACON_API_ETH_V1_EVENTS_CONTRIBUTION_AND_PROOF_V2 received_at="2025-01-07T11:56:00+10:00"
INFO[0004] event received                                event_type=BEACON_API_ETH_V1_EVENTS_ATTESTATION_V2 received_at="2025-01-07T11:56:00+10:00"
^CINFO[0005] Received shutdown signal
INFO[0005] Context cancelled, starting shutdown
INFO[0005] Stopping beacon node                          module=contributoor/ethereum/beacon
INFO[0005] Stopping service                              module=contributoor/ethereum/beacon service=metadata
INFO[0005] Stopping service                              module=contributoor/ethereum/beacon service=duties
INFO[0005] Stopping stdout sink
INFO[0005] Stopping xatu sink
INFO[0005] Shutdown complete