Implement SQLite Store using gorm and relational approach (#1065)

Restructure data handling for improved performance and flexibility. 
Introduce 'G'-prefixed fields to represent Gorm relations, simplifying resource management. 
Eliminate complexity in lookup tables for enhanced query and write speed. 
Enable independent operations on data structures, requiring adjustments in the Store interface and Account Manager.

management/server/group.go

@@ -23,6 +23,9 @@ type Group struct {
 	// ID of the group
 	ID string
 
+	// AccountID is a reference to Account that this object belongs
+	AccountID string `json:"-" gorm:"index"`
+
 	// Name visible in the UI
 	Name string
 
@@ -30,7 +33,7 @@ type Group struct {
 	Issued string
 
 	// Peers list of the group
-	Peers []string
+	Peers []string `gorm:"serializer:json"`
 }
 
 // EventMeta returns activity event meta related to the group