Refactor syscall modules to use async/await patterns

- Updated `DisplaySyscall` to use `tokio::io::AsyncWriteExt` for asynchronous text output.
- Refactored `FsSyscall` to read files asynchronously with offset and length handling.
- Modified `MemorySyscall` to use `tokio::task::spawn_blocking` for database operations, allowing async access to SQLite.
- Enhanced `NetworkSyscall` to utilize `reqwest` for HTTP requests, replacing the previous `curl` command execution.
- Improved `ProcessSyscall` to manage subprocesses with async tasks for stdin, stdout, and stderr handling.
- Updated `TimerSyscall` to simplify timer management.
- Adjusted plugin implementations for better async support and error handling.
- Added `tokio-stream` and `tracing-subscriber` dependencies to `Cargo.toml` for enhanced async stream handling and logging.

plugins/echo/src/main.rs

@@ -26,7 +26,10 @@ async fn main() -> Result<()> {
         .await?
         .into_inner();
     ensure!(register.ok, "register failed: {}", register.error);
-    println!("Register: ok={} session={}", register.ok, register.session_id);
+    println!(
+        "Register: ok={} session={}",
+        register.ok, register.session_id
+    );
 
     let mut display = DisplayClient::new(channel.clone());
     let resp = display
@@ -84,7 +87,11 @@ async fn main() -> Result<()> {
     ensure!(resp.ok, "FS.List failed: {}", resp.error);
     println!("FS.List: ok={} entries={}", resp.ok, resp.entries.len());
     for entry in resp.entries.iter().take(5) {
-        println!("  {} {}", entry.name, if entry.is_dir { "[dir]" } else { "" });
+        println!(
+            "  {} {}",
+            entry.name,
+            if entry.is_dir { "[dir]" } else { "" }
+        );
     }
 
     println!("\nAll syscalls verified OK!");