ext/sockets: adding IPPROTO_ICMP* constants for socket creations.

Is to create socket for Internet Control Message Protocol context.
Due to their nature, they are meant to be used via

ext/sockets: adding IPPROTO_ICMP* constants for socket creations.

Is to create socket for Internet Control Message Protocol context.
Due to their nature, they are meant to be used via
raw sockets rather than TCP/UDP.

close GH-16737

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