Remove generic Id param from RequestId (#6032)

* rename RequestId's for better context,

and move them to lighthouse_network crate.

* remove unrequired generic AppReqId from RequestID

beacon_node/network/src/sync/range_sync/batch.rs

@@ -1,6 +1,6 @@
-use crate::sync::manager::Id;
 use beacon_chain::block_verification_types::{AsBlock, RpcBlock};
 use lighthouse_network::rpc::methods::BlocksByRangeRequest;
+use lighthouse_network::service::api_types::Id;
 use lighthouse_network::PeerId;
 use std::collections::HashSet;
 use std::hash::{Hash, Hasher};