Implement more IoUring register functions

Future enhancement:
enter_ring_fd: u24,
init_flags: u8,

register functions that require the extra fields above like
io_uring_register_ring_fd, io_uring_close_ring_fd,
io_uring_clone_buffers_offset, io_uring_set_iowait not implemented

register_*_tag functions not implemented

remove unnecessary use of @ptrCast in io_uring_register

Signed-off-by: Bernard Assan <mega.alpha100@gmail.com>

Author: bernardassan