Add ICMP socket syscall support for toybox ping

[pradosh-arduino]

Motivation

• Expose a minimal Linux-like socket API so userland toybox utilities (notably ping) can send/receive ICMP using the kernel networking stack.
• Provide a small kernel-backed FD mechanism for virtual objects (sockets) so they occupy normal file descriptor slots.
• Surface clearer messaging from wget when HTTPS/TLS is not available while leaving TLS implementation for a later change.

Description

• Added fd_create_virtual to the stream layer to allocate virtual file-descriptor slots for kernel-backed objects. (source/kernel/C/stream.c, source/includes/stream.h).
• Declared syscall numbers and errno values for sendto, recvfrom, and setsockopt, and added protocol/errno constants required for the minimal socket implementation. (source/includes/syscalls.h).
• Implemented a lightweight AF_INET/SOCK_RAW/IPPROTO_ICMP path in the syscall layer: sys_socket, sys_sendto, sys_recvfrom, sys_setsockopt, and cleanup on close; added a small in-kernel socket table and sockaddr struct to map virtual FDs to the ICMP ping implementation. The new syscalls are wired into the syscall dispatcher and syscall name table. (source/kernel/C/syscalls.c).
• Updated wget usage/help and error messaging to clearly indicate that HTTPS/TLS requires TLS support which is not linked/implemented yet. (source/kernel/C/shell/commands/wget.c).

Testing

• Ran git diff --check, which reported no whitespace/format issues and completed successfully.
• Ran make -C source which compiled source files and reached the final link step; compilation of translation units succeeded but the final link failed because the environment lacked generated/version symbols (versions / date) required by the build system.
• Ran top-level make which failed during ISO staging because required prebuilt/staged artifacts (kernel ELF and Limine files) are not present in this environment; these failures are environmental and not caused by the introduced code.

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Codex Task