Adding semgrep yaml file

reduce IPv6 filter size below BPF_MAXINSNS

optimize hash function codegen

get rid of BTF dependency

update github.com/cilium/ebpf to v0.4.0

fix definition of __be32

rename test file

remove scenarios from tests

bpf: fix IPv6 and add tests

bpf: replace division with bit shift

return a helpful error when optmem sysctl is too low

bpf: use two distinct hash functions

bpf: check that packets are dropped on the correct level

bpf: fix ewma calculation

bpf: reduce countmin value size to 32bit