NETOBSERV-1545: Expose a counter of BPF drops (#304)

bpf/flows.c

bpf/maps_definition.h

bpf/types.h

pkg/ebpf/bpf_arm64_bpfel.go

pkg/ebpf/bpf_arm64_bpfel.o

pkg/ebpf/bpf_powerpc_bpfel.go

pkg/ebpf/bpf_powerpc_bpfel.o

pkg/ebpf/bpf_s390_bpfeb.go

pkg/ebpf/bpf_s390_bpfeb.o

pkg/ebpf/bpf_x86_bpfel.go

pkg/ebpf/bpf_x86_bpfel.o

pkg/ebpf/tracer.go

pkg/ebpf/tracer_legacy.go