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

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

@@ -0,0 +1,14 @@
+mod local_file;
+mod ssh;
+use async_trait::async_trait;
+pub use local_file::*;
+pub use ssh::*;
+
+use crate::Error;
+
+#[async_trait]
+pub trait ConfigManager: std::fmt::Debug + Send + Sync {
+    async fn load_as_str(&self) -> Result<String, Error>;
+    async fn save_config(&self, content: &str) -> Result<(), Error>;
+    async fn apply_new_config(&self, content: &str) -> Result<(), Error>;
+}