Improve the eBPF integration

[abeaumont]

Our current eBPF support can be improved in some areas, including:

• It's built on top of (python) bcc tools, which is thus a dependency.
• It periodically loads / unloads the the BPF program, which may cause some profiling precission loss.
• No support for BTF / CO-RE.

Some of these improvements may require higher minimal Linux kernel versions, to there are also some trade-offs to consider.

[petethepig]

Tentative plan:

• Get the python-less version of ebpfspy to run
• Get ebpfspy to run without compiling ebpf program each time
• Make ebpfspy work on old versions of Linux as well (without CO-RE) https://github.com/aquasecurity/btfhub

[Rperry2174]

Improved see blog post here