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/cli/unlock.rs

@@ -1,12 +1,17 @@
 use {
-    crate::{cli::GlobalArgs, tools::tool_client::ToolClient, wire::jay_compositor::Unlock},
+    crate::{
+        cli::GlobalArgs,
+        tools::tool_client::{with_tool_client, ToolClient},
+        wire::jay_compositor::Unlock,
+    },
     std::rc::Rc,
 };
 
 pub fn main(global: GlobalArgs) {
-    let tc = ToolClient::new(global.log_level.into());
-    let logger = Rc::new(Unlocker { tc: tc.clone() });
-    tc.run(run(logger));
+    with_tool_client(global.log_level.into(), |tc| async move {
+        let logger = Rc::new(Unlocker { tc: tc.clone() });
+        run(logger).await;
+    });
 }
 
 struct Unlocker {