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/user.go

@@ -44,14 +44,17 @@ type UserRole string
 
 // User represents a user of the system
 type User struct {
-	Id            string
+	Id string `gorm:"primaryKey"`
+	// AccountID is a reference to Account that this object belongs
+	AccountID     string `json:"-" gorm:"index"`
 	Role          UserRole
 	IsServiceUser bool
 	// ServiceUserName is only set if IsServiceUser is true
 	ServiceUserName string
 	// AutoGroups is a list of Group IDs to auto-assign to peers registered by this user
-	AutoGroups []string
-	PATs       map[string]*PersonalAccessToken
+	AutoGroups []string                        `gorm:"serializer:json"`
+	PATs       map[string]*PersonalAccessToken `gorm:"-"`
+	PATsG      []PersonalAccessToken           `json:"-" gorm:"foreignKey:UserID;references:id"`
 	// Blocked indicates whether the user is blocked. Blocked users can't use the system.
 	Blocked bool
 	// LastLogin is the last time the user logged in to IdP
@@ -124,6 +127,7 @@ func (u *User) Copy() *User {
 	}
 	return &User{
 		Id:              u.Id,
+		AccountID:       u.AccountID,
 		Role:            u.Role,
 		AutoGroups:      autoGroups,
 		IsServiceUser:   u.IsServiceUser,