Add TUN device name setting support to easytier-gui

[Hs-Yeah]

No description provided.

[Hs-Yeah]

I think we can wait for #363 to be merged, after that I can update the logic to fetch the dev_name for Status page from global_ctx.

[KKRainbow]

#363 is merged

[Hs-Yeah]

New commit pushed, dev_name is now fetched from the global_ctx of each instance.

Tested on Windows 10, with two EasyTier networks running as the same time.

[KKRainbow]

error[E0382]: borrow of partially moved value: `data`
   --> easytier/src/launcher.rs:176:50
    |
138 |           tasks.spawn(async move {
    |  _____________________-
139 | |             loop {
140 | |
141 | |                 // Update TUN Device Name
142 | |                 *data.tun_dev_name.write().unwrap() = global_ctx_c.get_flags().dev_name.clone();
    | |                  ----------------- variable partially moved due to use in coroutine
...   |
172 | |             }
173 | |         });
    | |_________- value partially moved here
...
176 |           Self::run_routine_for_android(&instance, &data, &mut tasks).await;
    |                                                    ^^^^^ value borrowed here after partial move
    |
    = note: partial move occurs because `data.tun_dev_name` has type `Arc<std::sync::RwLock<std::string::String>>`, which does not implement the `Copy` trait

For more information about this error, try `rustc --explain E0382`.
error: could not compile `easytier` (lib) due to 1 previous error
    Error `Failed to run `cargo build`: command ["cargo", "build", "--package", "easytier-gui", "--manifest-path", "/home/runner/work/EasyTier/EasyTier/easytier-gui/src-tauri/Cargo.toml", "--target", "aarch64-linux-android", "--features", "tauri/custom-protocol tauri/rustls-tls", "--lib", "--release"] exited with code 101
 ELIFECYCLE  Command failed with exit code 1.