Add support for `/proc/net/raw`

[AdvH039]

/proc/net/raw can be used to view raw sockets and those that follow ICMP protocol

[AdvH039]

Can I work on this issue?

[eminence]

Sure, please go ahead

[AdvH039]

Also I wanted to ask, are there more ways to collect per-socket entries for icmp sockets, not just the raw ones, like ping command uses datagram socket type and not raw socket type..thanks!!

[AdvH039]

@eminence Also the parsing for the /proc/net/raw file is very similar to that done in /proc/net/udp, should I just imitate the code done in udp for raw or create some common interface that can handle both udp and raw files? I am a bit new to rust so I would appreciate your help!!