Revert "Removed the opengraph type dependency for plugins by stripping post Metadata (#20612)" (#20684)

This reverts commit da7a8a4552.

plugin/client_rpc.go

@@ -21,6 +21,7 @@ import (
 	"reflect"
 	"sync"
 
+	"github.com/dyatlov/go-opengraph/opengraph"
 	"github.com/go-sql-driver/mysql"
 	"github.com/hashicorp/go-plugin"
 	"github.com/lib/pq"
@@ -163,6 +164,7 @@ func init() {
 	gob.Register(&pq.Error{})
 	gob.Register(&mysql.MySQLError{})
 	gob.Register(&ErrorString{})
+	gob.Register(&opengraph.OpenGraph{})
 	gob.Register(&model.AutocompleteDynamicListArg{})
 	gob.Register(&model.AutocompleteStaticListArg{})
 	gob.Register(&model.AutocompleteTextArg{})