Refactor consensus/types (#7827)

Organize and categorize `consensus/types` into modules based on their relation to key consensus structures/concepts.
This is a precursor to a sensible public interface.

While this refactor is very opinionated, I am open to suggestions on module names, or type groupings if my current ones are inappropriate.


Co-Authored-By: Mac L <mjladson@pm.me>

beacon_node/http_api/src/produce_block.rs

@@ -9,6 +9,7 @@ use crate::{
 use beacon_chain::{
     BeaconBlockResponseWrapper, BeaconChain, BeaconChainTypes, ProduceBlockVerification,
 };
+use eth2::beacon_response::ForkVersionedResponse;
 use eth2::types::{self as api_types, ProduceBlockV3Metadata, SkipRandaoVerification};
 use lighthouse_tracing::{SPAN_PRODUCE_BLOCK_V2, SPAN_PRODUCE_BLOCK_V3};
 use ssz::Encode;