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/policy.go

@@ -63,7 +63,10 @@ type PolicyUpdateOperation struct {
 // PolicyRule is the metadata of the policy
 type PolicyRule struct {
 	// ID of the policy rule
-	ID string
+	ID string `gorm:"primaryKey"`
+
+	// PolicyID is a reference to Policy that this object belongs
+	PolicyID string `json:"-" gorm:"index"`
 
 	// Name of the rule visible in the UI
 	Name string
@@ -78,10 +81,10 @@ type PolicyRule struct {
 	Action PolicyTrafficActionType
 
 	// Destinations policy destination groups
-	Destinations []string
+	Destinations []string `gorm:"serializer:json"`
 
 	// Sources policy source groups
-	Sources []string
+	Sources []string `gorm:"serializer:json"`
 
 	// Bidirectional define if the rule is applicable in both directions, sources, and destinations
 	Bidirectional bool
@@ -90,7 +93,7 @@ type PolicyRule struct {
 	Protocol PolicyRuleProtocolType
 
 	// Ports or it ranges list
-	Ports []string
+	Ports []string `gorm:"serializer:json"`
 }
 
 // Copy returns a copy of a policy rule
@@ -128,8 +131,11 @@ func (pm *PolicyRule) ToRule() *Rule {
 
 // Policy of the Rego query
 type Policy struct {
-	// ID of the policy
-	ID string
+	// ID of the policy'
+	ID string `gorm:"primaryKey"`
+
+	// AccountID is a reference to Account that this object belongs
+	AccountID string `json:"-" gorm:"index"`
 
 	// Name of the Policy
 	Name string
@@ -141,7 +147,7 @@ type Policy struct {
 	Enabled bool
 
 	// Rules of the policy
-	Rules []*PolicyRule
+	Rules []*PolicyRule `gorm:"foreignKey:PolicyID;references:id"`
 }
 
 // Copy returns a copy of the policy.
@@ -201,7 +207,6 @@ type FirewallRule struct {
 // This function returns the list of peers and firewall rules that are applicable to a given peer.
 func (a *Account) getPeerConnectionResources(peerID string) ([]*Peer, []*FirewallRule) {
 	generateResources, getAccumulatedResources := a.connResourcesGenerator()
-
 	for _, policy := range a.Policies {
 		if !policy.Enabled {
 			continue