Support console input to VM

createVm accepts a new ParcelFileDescriptor which when set is used as
the console input in the VM. The `vm` tool sets this to stdin unless
explicitly specified via `--console-in`. This will be useful for
bringing up custom OSes.

Note that Java APIs for this is not added in this CL.

Bug: 263360203
Test: Start a vm using the `vm` tool. Type something. Then do `cat
/dev/console` in the VM. It shows the typed characters.
Change-Id: I5d0dfcc4852387ec50897a8dcae2935dd4a2dd9a
diff --git a/rialto/tests/test.rs b/rialto/tests/test.rs
index 7048b44..98c935d 100644
--- a/rialto/tests/test.rs
+++ b/rialto/tests/test.rs
@@ -114,8 +114,15 @@
         taskProfiles: vec![],
         gdbPort: 0, // No gdb
     });
-    let vm = VmInstance::create(service.as_ref(), &config, Some(console), Some(log), None)
-        .context("Failed to create VM")?;
+    let vm = VmInstance::create(
+        service.as_ref(),
+        &config,
+        Some(console),
+        /* consoleIn */ None,
+        Some(log),
+        None,
+    )
+    .context("Failed to create VM")?;
 
     vm.start().context("Failed to start VM")?;