Add tracepoint_raw attach support

[Mr-Pine]

This adds support for attaching tracepoint_raw functions:

@BPFFunction(
        headerTemplate = "int BPF_PROG($name, struct pt_regs *regs, unsigned long number)",
        lastStatement = "return 0;",
        section = "raw_tracepoint/sys_enter",
        autoAttach = true
)
public void syscall_counter(Ptr<PtDefinitions.pt_regs> regs, @Unsigned long number) {
    syscalls.set(syscalls.get() + 1);
}

try (var program = BPFProgram.load(RawTracepoints.class)) {
    program.rawTracepointAttach("syscall_counter", "sys_enter");
}

[parttimenerd]

Nice work. Could you add an example to bpf-samples?

[Mr-Pine]

I added a syscall counter to the samples