Add support of parsing netlink message reply of iw phy

Expanding `Nl80211Attr` to support parsing reply of `iw phy` on linux
kernel 6.10.10.

Tested on archlinux by command:

```bash
cargo run --example dump_nl80211_wiphy
```

Signed-off-by: Gris Ge <fge@redhat.com>

Author: cathay4t

Cargo.toml

@@ -4,7 +4,7 @@ name = "wl-nl80211"
 version = "0.1.2"
 authors = ["Gris Ge <fge@redhat.com>"]
 license = "MIT"
-edition = "2018"
+edition = "2021"
 description = "Linux kernel wireless(802.11) netlink Library"
 homepage = "https://github.com/rust-netlink/wl-nl80211"
 repository = "https://github.com/rust-netlink/wl-nl80211"
@@ -25,6 +25,7 @@ smol_socket = ["netlink-proto/smol_socket", "async-std"]
 [dependencies]
 anyhow = "1.0.44"
 async-std = { version = "1.9.0", optional = true}
+bitflags = "2"
 byteorder = "1.4.3"
 futures = "0.3.17"
 log = "0.4.14"

examples/dump_nl80211_wiphy.rs

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+
+use futures::stream::TryStreamExt;
+
+fn main() {
+    let rt = tokio::runtime::Builder::new_current_thread()
+        .enable_io()
+        .build()
+        .unwrap();
+    rt.block_on(get_wireless_physics());
+}
+
+async fn get_wireless_physics() {
+    let (connection, handle, _) = wl_nl80211::new_connection().unwrap();
+    tokio::spawn(connection);
+
+    let mut phy_handle = handle.wireless_physic().get().execute().await;
+
+    let mut msgs = Vec::new();
+    while let Some(msg) = phy_handle.try_next().await.unwrap() {
+        msgs.push(msg);
+    }
+    assert!(!msgs.is_empty());
+    for msg in msgs {
+        println!("{:?}", msg);
+    }
+}