Custom CO-RE BPF probe

[erthalion]

Implement custom version of CO-RE BPF probe, following the same approach as for
the custom EBPF one. The proposed solution:

• Restructure current kernel-modules/probe to contain two subdirectories,
  ebpf and core_bpf for custom ebpf and core_bpf probes correspondingly.

• Construct a cmake configuration, similar to that in Falco, to build
  separate probes with modern_bpf dependencies.

• For each captured syscall introduce one probe with two BPF progs
  tp_btf/sys_{enter|exit}_syscall, similar to attached progs from Falco.

• Teach the cmake configuration to assemble the final probe by picking up the
  custom bits and the actual tail-called BPF program from the Falco build.

• Verify it's limitations for other architectures.