Integrate VPC metadata enrichment for netflow IP addresses (#611)

 - Added VPCIndex in-memory index for IP metadata lookups across VPCs, subnets, peered networks, and service ranges
- Periodic refresh from cloud provider with configurable interval
- gRPC endpoint GetIPsInfo enriches IPs with VPC metadata (region, zone, cloud service detection via domain)
- Improved zone/region detection with kube nodes info

Author: RomanMelnyk113

api/v1/kube/kube_api.pb.go

@@ -18,6 +18,7 @@ message GetClusterInfoRequest {}
 message GetClusterInfoResponse {
   repeated string pods_cidr = 1;
   repeated string service_cidr = 2;
+  repeated string other_cidr = 3;
 }
 
 message GetIPInfoRequest {
@@ -44,7 +45,9 @@ message IPInfo {
   string workload_kind = 5;
   string workload_uid = 6;
   string zone = 7;
+  string region = 10;
   string node_name = 8;
+  string cloud_domain = 11;
   bytes ip = 9;
 }
 
@@ -72,6 +75,7 @@ message Pod {
   string workload_name = 2;
   WorkloadKind workload_kind = 3;
   string zone = 4;
+  string region = 6;
   string node_name = 5;
 }
 

api/v1/kube/kube_api.proto

@@ -168,6 +168,7 @@ message Netflow {
   string workload_name = 6;
   string workload_kind = 7;
   string zone = 8;
+  string region = 16;
   string node_name = 13;
   bytes addr = 9;
   uint32 port = 10;
@@ -183,6 +184,7 @@ message NetflowDestination {
   string workload_name = 3;
   string workload_kind = 4;
   string zone = 5;
+  string region = 15;
   string dns_question = 6;
   string node_name = 14;
   bytes addr = 8;