feat: show rayhunter version/os/arch in pcap, ndjson, qmdl manifest

Create a util mod to provide information about the rayhunter binary and
system.

lib/src/util.rs

@@ -0,0 +1,35 @@
+use nix::sys::utsname::uname;
+
+/// Expose binary and system information.
+pub struct RayhunterMetadata {
+    pub name: String,
+    pub version: String,
+    pub os: String,
+    pub arch: String,
+    pub hardware: String,
+}
+
+impl RayhunterMetadata {
+    pub fn new() -> Self {
+        match uname() {
+            Ok(utsname) => RayhunterMetadata {
+                name: env!("CARGO_PKG_NAME").to_owned(),
+                version: env!("CARGO_PKG_VERSION").to_owned(),
+                arch: format!("{}", utsname.machine().to_string_lossy()),
+                os: format!(
+                    "{} {}",
+                    utsname.sysname().to_string_lossy(),
+                    utsname.release().to_string_lossy(),
+                ),
+                hardware: String::from("unknown"),
+            },
+            Err(_) => RayhunterMetadata {
+                name: env!("CARGO_PKG_NAME").to_owned(),
+                version: env!("CARGO_PKG_VERSION").to_owned(),
+                arch: std::env::consts::ARCH.to_string(),
+                os: std::env::consts::OS.to_string(),
+                hardware: String::from("unknown"),
+            },
+        }
+    }
+}