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7ad13c8adb
This commit updates the codebase to use the `Icmp4Header` type directly, replacing the nested `Ip4::Icmp::Header` type. The empty `Ip4::Icmp` wrapper class is removed to simplify the header definition. This change aligns the ICMPv4 header structure with the flat naming conventions used for other IP headers (e.g., `Ip6::Icmp6Header`, `Ip6::UpdHeader`).