Improve block header signature handling (#8253)

Closes:

- https://github.com/sigp/lighthouse/issues/7650


  Reject blob and data column sidecars from RPC with invalid signatures.


Co-Authored-By: Michael Sproul <michael@sigmaprime.io>

beacon_node/beacon_chain/tests/main.rs

@@ -1,8 +1,10 @@
 mod attestation_production;
 mod attestation_verification;
 mod bellatrix;
+mod blob_verification;
 mod block_verification;
 mod capella;
+mod column_verification;
 mod events;
 mod op_verification;
 mod payload_invalidation;