Revert "change aggregation flow map to hashmap instead perCPU hashmap (#118)" (#172)

bpf/flows.c

bpf/maps_definition.h

bpf/utils.h

docs/architecture.md

examples/flowlogs-dump/server/flowlogs-dump-collector.go

pkg/agent/agent.go

pkg/agent/agent_test.go

pkg/ebpf/bpf_bpfeb.o

pkg/ebpf/bpf_bpfel.o

pkg/ebpf/tracer.go

pkg/flow/account.go

pkg/flow/account_test.go

pkg/flow/record.go

pkg/flow/tracer_map.go

pkg/flow/tracer_map_test.go

pkg/test/tracer_fake.go