feat(ebpf): pythonless, portable ebpf

[korniltsev]

In it's current state this PR:

• removes python dependency
• we now compile BPF program once (CO:RE) — no longer compile BPF program each 10 seconds
• there's no longer need for linux headers to be present on the system

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Have been running in our cluster for the last few days and everything seems to be working great — there's no memory leaks and CPU performance overhead is currently at around 0.25%.

TODOs:

• make a separate command
• make some parameters (like symbol cache sizes) configurable
• add labels from k8s automatically
• use pprof as transport format (might make it more efficient once we add labels from k8s) - decided to postpone, maybe reuse transporttrie, maybe something else

[petethepig]

marked as ready so that I can get a docker image

[petethepig]

we should make the command be pyroscope ebpf. ebpfspy is more obscure, and long term we're trying to get rid of this whole "spy" suffix.

[petethepig]

Looks good!