Rename *codec.Codec to *codec.LegacyAmino (#6991)

* Rename *codec.Codec to *codec.LegacyAmino

* Implement requested changes

Co-authored-by: Aaron Craelius <aaron@regen.network>

codec/types/compat.go

@@ -25,7 +25,7 @@ func anyCompatError(errType string, x interface{}) error {
 	}
 	return fmt.Errorf(
 		"%s marshaling error for %+v, this is likely because "+
-			"amino is being used directly (instead of codec.Codec which is preferred) "+
+			"amino is being used directly (instead of codec.LegacyAmino which is preferred) "+
 			"or UnpackInterfacesMessage is not defined for some type which contains "+
 			"a protobuf Any either directly or via one of its members. To see a "+
 			"stacktrace of where the error is coming from, set the var Debug = true "+