chore: Reorganize file tree for easier onboarding. Rust project now at the root for simple git clone && cargo run

opnsense-config/src/config/manager/local_file.rs

@@ -0,0 +1,30 @@
+use crate::config::manager::ConfigManager;
+use crate::error::Error;
+use async_trait::async_trait;
+use std::fs;
+
+#[derive(Debug)]
+pub struct LocalFileConfigManager {
+    file_path: String,
+}
+
+impl LocalFileConfigManager {
+    pub fn new(file_path: String) -> Self {
+        Self { file_path }
+    }
+}
+
+#[async_trait]
+impl ConfigManager for LocalFileConfigManager {
+    async fn load_as_str(&self) -> Result<String, Error> {
+        Ok(fs::read_to_string(&self.file_path)?)
+    }
+
+    async fn save_config(&self, content: &str) -> Result<(), Error> {
+        Ok(fs::write(&self.file_path, content)?)
+    }
+
+    async fn apply_new_config(&self, content: &str) -> Result<(), Error> {
+        self.save_config(content).await
+    }
+}