Use libevm instead of coreth (#3918)

Co-authored-by: Stephen Buttolph <[email protected]>

## Why this should be merged

## How this works

## How this was tested

## Need to be documented in RELEASES.md?

Author: samliok

message/fields.go

@@ -62,6 +62,8 @@ var (
 	_ deadlineGetter = (*p2p.PushQuery)(nil)
 	_ deadlineGetter = (*p2p.PullQuery)(nil)
 	_ deadlineGetter = (*p2p.AppRequest)(nil)
+
+	_ chainIDGetter = (*p2p.SimplexMessage)(nil)
 )
 
 type chainIDGetter interface {

proto/p2p/p2p.proto

@@ -9,7 +9,7 @@ option go_package = "github.com/ava-labs/avalanchego/proto/pb/p2p";
 // Only one type can be non-null.
 message Message {
   reserved 1; // Until E upgrade is activated.
-  reserved 36; // Next unused field number.
+  reserved 37; // Next unused field number.
   // NOTES
   // Use "oneof" for each message type and set rest to null if not used.
   // That is because when the compression is enabled, we don't want to include uncompressed fields.
@@ -55,6 +55,9 @@ message Message {
     AppResponse app_response = 31;
     AppGossip app_gossip = 32;
     AppError app_error = 34;
+
+    // Simplex messages:
+    SimplexMessage simplex_message = 36;
   }
 }
 
@@ -419,3 +422,97 @@ message AppGossip {
   // Message body
   bytes app_bytes = 2;
 }
+
+message SimplexMessage {
+  // Chain being responded from
+  bytes chain_id = 1;
+
+  oneof message {
+    Block block = 2;
+    Vote vote = 3;
+    EmptyVote empty_vote = 4;
+    Finalization finalization = 5;
+    Notarization notarization = 6;
+    EmptyNotarization empty_notarization = 7;
+    FinalizationCertificate finalization_certificate = 8;
+    ReplicationResponse replication_response = 9;
+    ReplicationRequest replication_request = 10;
+  }
+}
+
+message Block {
+  bytes block = 1;
+  Vote vote = 2;
+}
+
+message ProtocolMetadata {
+  // Version defines the version of the protocol this block was created with.
+  uint32 version = 1;
+  // Epoch returns the epoch in which the block was proposed
+  uint64 epoch = 2;
+  // Round returns the round number in which the block was proposed.
+  // Can also be an empty block.
+  uint64 round = 3;
+  // Seq is the order of the block among all blocks in the blockchain.
+  // Cannot correspond to an empty block.
+  uint64 seq = 4;
+  // Prev returns the digest of the previous data block
+  bytes prev = 5;
+}
+
+message BlockHeader {
+  ProtocolMetadata metadata = 1;
+  bytes digest = 2;
+}
+
+message Signature {
+  bytes signer = 1;
+  bytes value = 2;
+}
+
+message Vote {
+  BlockHeader vote = 1;
+  Signature signature = 2;
+}
+
+message EmptyVote {
+  ProtocolMetadata vote = 1;
+  Signature signature = 2;
+}
+
+message Finalization {
+  BlockHeader vote = 1;
+  Signature signature = 2;
+}
+
+message FinalizationCertificate {
+  Finalization finalization = 1;
+  bytes quorum_certificate = 2;
+}
+
+message Notarization {
+  BlockHeader vote = 1;
+  bytes quorum_certificate = 2;
+}
+
+message EmptyNotarization {
+  BlockHeader empty_vote = 1;
+  bytes quorum_certificate = 2;
+}
+
+message ReplicationRequest {
+  repeated uint64 seqs = 1; // array of seqs being requested
+  uint64 latest_round = 2; // latest round, our node has
+}
+
+message ReplicationResponse {
+  repeated QuorumRound data = 1;
+  QuorumRound latest_round = 2;
+}
+
+message QuorumRound {
+  Block block = 1;
+  Notarization notarization = 2;
+  EmptyNotarization empty_notarization = 3;
+  FinalizationCertificate finalization = 4;
+}