feat(codec)!: add get signers to codec + merged proto registry to InterfaceRegistry (#15600)

Co-authored-by: Matt Kocubinski <mkocubinski@gmail.com>

codec/codec.go

@@ -3,6 +3,7 @@ package codec
 import (
 	"github.com/cosmos/gogoproto/proto"
 	"google.golang.org/grpc/encoding"
+	protov2 "google.golang.org/protobuf/proto"
 
 	"github.com/cosmos/cosmos-sdk/codec/types"
 )
@@ -18,6 +19,26 @@ type (
 	Codec interface {
 		BinaryCodec
 		JSONCodec
+
+		// InterfaceRegistry returns the interface registry.
+		InterfaceRegistry() types.InterfaceRegistry
+
+		// GetMsgAnySigners returns the signers of the given message encoded in a protobuf Any
+		// as well as the decoded google.golang.org/protobuf/proto.Message that was used to
+		// extract the signers so that this can be used in other contexts.
+		GetMsgAnySigners(msg *types.Any) ([]string, protov2.Message, error)
+
+		// GetMsgV2Signers returns the signers of the given message.
+		GetMsgV2Signers(msg protov2.Message) ([]string, error)
+
+		// GetMsgV1Signers returns the signers of the given message plus the
+		// decoded google.golang.org/protobuf/proto.Message that was used to extract the
+		// signers so that this can be used in other contexts.
+		GetMsgV1Signers(msg proto.Message) ([]string, protov2.Message, error)
+
+		// mustEmbedCodec requires that all implementations of Codec embed an official implementation from the codec
+		// package. This allows new methods to be added to the Codec interface without breaking backwards compatibility.
+		mustEmbedCodec()
 	}
 
 	BinaryCodec interface {