Support versatile io_uring-based asynchronous I/O to handle various patterns

[kingcrimsontianyu]

Currently KvikIO provides efficient APIs to handle the following I/O patterns:

• FileHandle: Sequential I/O using standard system calls and cuFile/GDS, respectively
• BatchHandle: Arbitrary I/O patterns such as random and strided patterns using cuFile/GDS only

KvikIO can implement an io_uring-based I/O backend for FileHandle and BatchHandle. The potential benefits include:

• Filling the gap where the batched I/O, with the potential of significantly improving IOPS for small ranges, is missing outside the context of cuFile/GDS. This will address Support for strided reads/writes? #826 on systems without cuFile/GDS support.
• Reducing resources for I/O management and therefore reducing overall CPU usage