chore: refactor CLI app with new modules for seperation of concerns, reusable components and consistent styling

soulseek-rs/src/config.rs

@@ -0,0 +1,13 @@
+pub struct SearchConfig {
+    pub username: String,
+    pub password: String,
+    pub server_host: String,
+    pub server_port: u16,
+    pub enable_listener: bool,
+    pub listener_port: u32,
+    pub query: String,
+    pub timeout: u64,
+    pub download_dir: String,
+    pub verbose: u8,
+    pub max_concurrent_downloads: usize,
+}