Completion-based I/O event loop for Zig.

This is a low-level library, intended to be used as part of zio or a similar runtime.

Supports Linux (io_uring/epoll/poll), FreeBSD (kqueue/poll), NetBSD (kqueue/poll), macOS (kqueue/poll) and Windows (iocp/poll).

Features:

• Socket operations: net_open, net_close, net_bind, net_listen, net_accept, net_connect, net_send, net_recv, net_sendto, net_recvfrom
• File operations: file_open, file_close, file_read, file_write, file_sync, file_rename, file_delete
• Timers: timer
• Cancelation: cancel
• Cross-thread notifications: async
• Auxiliary thread pool for blocking tasks: work