io: use io_uring for all io

There should no longer be any

- read
- write
- connect
- sendmsg
- recvmsg
- accept

calls in the codebase. Previously we were using a mix of io_uring and
these calls which had some negative effects: Since we were using the old
system calls, we had to set the file descriptors to non-blocking. But
our io_uring code did not handle EAGAIN. This lead to programs sometimes
being killed when the wayland IO was actually blocking.

Now all file descriptors are set to blocking, but io_uring makes it
non-blocking from our perspective. The one exception are evdev files
because they are read via libinput and libinput uses the old system
calls.

src/io_uring/ops.rs

@@ -1,11 +1,13 @@
 use crate::{io_uring::IoUringError, utils::oserror::OsError};
 
+pub mod accept;
 pub mod async_cancel;
+pub mod connect;
 pub mod poll;
+pub mod read_write;
 pub mod recvmsg;
 pub mod sendmsg;
 pub mod timeout;
-pub mod write;
 
 pub type TaskResult<T> = Result<Result<T, OsError>, IoUringError>;