feature request: support submit multi sqe with link at once

[Sherlock-Holo]

currently the submit only support submit 1 op

however, in io-uring, the kernel support submit a batch sqe with IO_LINK

this allow user submit a batch sequence ops, and wait them complete, with only 1 submit call

A common case is when you have a batch of data to write into the fd which is datagram mode