Log ttd (#3339)

## Issue Addressed

Resolves #3249 

## Proposed Changes

Log merge related parameters and EE status in the beacon notifier before the merge.


Co-authored-by: Paul Hauner <paul@paulhauner.com>

beacon_node/beacon_chain/src/lib.rs

@@ -20,6 +20,7 @@ pub mod fork_choice_signal;
 pub mod fork_revert;
 mod head_tracker;
 pub mod historical_blocks;
+pub mod merge_readiness;
 mod metrics;
 pub mod migrate;
 mod naive_aggregation_pool;