Use eBPF RingBuffer instead of PerfEvent

[qjerome]

RingBuffer is a more modern and performant way to transmit information from kernel to user land.
So event forwarding could be implemented using it, the only issue is kernel compatibility. It is available only since kernel 5.8 so we cannot replace completely PerfEvent (because kunai currently support kernels back to 5.4).

Resources:
https://github.com/aya-rs/aya/blob/main/test/integration-test/src/tests/ring_buf.rs
https://github.com/aya-rs/aya/blob/main/test/integration-ebpf/src/ring_buf.rs