add basic plugin architecture

pkg/register/plugin_server.go

@@ -1,10 +1,25 @@
 package register
 
+import (
+	"context"
+	"encoding/json"
+)
+
 type PluginServer struct {
 	Impl Plugin
 }
 
 func (ps *PluginServer) About(args any, resp *string) error {
-	*resp = ps.Impl.About()
+	r, err := ps.Impl.About(context.Background())
+	if err != nil {
+		return err
+	}
+
+	respB, err := json.Marshal(r)
+	if err != nil {
+		return err
+	}
+
+	*resp = string(respB)
 	return nil
 }