There's other adjustment/addition:
* Function name CQE/SQE renamed to Cqe/Sqe.
* SQ entry union sets value withput util to reduce function
complexity, so leaving function budget for another stuff.
* UserData has its own type, implement for uint64, uintptr,
and unsafe.
* TODO: decide what to use `Syscall` or `RawSyscall`.
* Exposed `SeenCqe`.
* Ignore *.test file extension.
* Inline cost tool.
Signed-off-by: Nugraha <richiisei@gmail.com>
