Port ebpf_exporter to Windows

Now that Microsoft is working on implementing eBPF on Windows (https://github.com/microsoft/ebpf-for-windows), it would be nice to have ebpf_exporter also on Windows, for increased observability. As the implementation is libbpf-based, this seems to tie in with work on supporting libbpf/CORE (https://github.com/cloudflare/ebpf_exporter/pull/130). I created a related issue on https://github.com/microsoft/ebpf-for-windows/issues/730.