adds crds-value for broadcasting duplicate shreds through gossip (#14133)

In gossip, the header overhead we get from:
https://github.com/solana-labs/solana/blob/de9ac43eb/core/src/cluster_info.rs#L434-L435
https://github.com/solana-labs/solana/blob/de9ac43eb/core/src/crds_value.rs#L31-L36
https://github.com/solana-labs/solana/blob/de9ac43eb/core/src/crds_value.rs#L73
already exceeds SIZE_OF_NONCE in shreds. We also need aditional
meta-data (wallclock, source pubkey, ...). Which means that given the
SHRED_PAYLOAD_SIZE, we cannot fit all these in PACKET_DATA_SIZE:
https://github.com/solana-labs/solana/blob/de9ac43eb/ledger/src/shred.rs#L80

On top of that, we need 2 shred payloads as the proof of duplicate. So
each DuplicateShred crds value includes only a chunk of the payload,
along with the meta-data to reconstruct the full payload from the chunks
on the receiving end.

ledger/src/lib.rs

@@ -1,3 +1,4 @@
+#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
 #[macro_use]
 extern crate solana_bpf_loader_program;
 
@@ -32,3 +33,6 @@ extern crate log;
 
 #[macro_use]
 extern crate lazy_static;
+
+#[macro_use]
+extern crate solana_frozen_abi_macro;

ledger/src/shred.rs

@@ -119,7 +119,7 @@ pub enum ShredError {
 
 pub type Result<T> = std::result::Result<T, ShredError>;
 
-#[derive(Serialize, Clone, Deserialize, PartialEq, Debug)]
+#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq, AbiExample, Deserialize, Serialize)]
 pub struct ShredType(pub u8);
 impl Default for ShredType {
     fn default() -> Self {