[client] introduce client-side event aggregation (#6627)

* added an implementation of aggregating memory store

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* initial support for aggregation of events

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* added tcp-aggregation test

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* added manager integration test

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* added tracking of the number of start-, drop, and end-events in an aggregation window

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* fixes based on sonarcube checks

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* regenerated proto files

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* removed inadvertenly added google proto files

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* pacifying linter

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* update test to validate event aggregation over tcp, udp, icmp, and icmpv6

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* updated event aggregation test

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* regenerate protobufs with expected versions of protoc and protoc-gen-go

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* remove protoc/protoc-gen headers from flow_grpc.pb.go

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* updated openapi spec

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* updated openapi NetworkTrafficEvent spec, regenerated types

Signed-off-by: Dmitri <dmitri.external@netbird.io>

* respond to feedback

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* fixed an issue with how we track events that shouldn't be aggregated

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* fixed mapping of events to protobuf

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* icmp code values in aggregated events do not matter

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* regenerate openapi types

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* added a comment re: unbounded unacked events

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* reset aggregated event type to unknown

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* fix event aggregation test

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* used the source port of the earliest event

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* add tracking of window starts and ends

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* updated openapi spec

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* reverted changes to generate.sh

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* cleanup handling of not-aggregated events + test

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* responded to feedback + small fixes

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* small fix in a test

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* another test

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* force setting non-empty rule id on aggregated events

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* fixed a couple of issues flagged by coderabbit

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* fix spelling

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

* handle exhausted retry backoffs

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

---------

Signed-off-by: Dmitri <dmitri.external@netbird.io>
Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

flow/proto/flow.proto

@@ -24,6 +24,9 @@ message FlowEvent {
   FlowFields flow_fields = 4;
 
   bool isInitiator = 5;
+
+  google.protobuf.Timestamp window_start = 6;
+  google.protobuf.Timestamp window_end = 7;
 }
 
 message FlowEventAck {
@@ -75,6 +78,9 @@ message FlowFields {
   bytes source_resource_id = 14;
   bytes dest_resource_id = 15;
 
+  uint64 num_of_starts = 16;
+  uint64 num_of_ends = 17;
+  uint64 num_of_drops = 18;
 }
 
 // Flow event types