Write `get-file` and commands to get the list of blocks from another node

Description

This closes #1 (closed) by providing an API that allows to get a file with just its hash

Detailed list of changes

• add get_file, get_blocks_info_from and other things related to managing the filesystem
• add new commands to nu API
• remove DragoonBehaviour as it was not useful
• add two new tests for get_file and change the already existing test to use the new API

Note

The get_file is still very rough, the error management needs to be handled better to take into a lot more cases of failure

src/commands.rs

@@ -111,6 +111,7 @@ pub(crate) enum DragoonCommand {
     },
     GetFile {
         file_hash: String,
+        output_filename: String,
         powers_path: String,
         sender: SenderOneS<String>,
     },
@@ -318,11 +319,11 @@ pub(crate) async fn create_cmd_get_connected_peers(State(state): State<Arc<AppSt
 }
 
 pub(crate) async fn create_cmd_get_file(
-    Path((file_hash, powers_path)): Path<(String, String)>,
+    Path((file_hash, output_filename, powers_path)): Path<(String, String, String)>,
     State(state): State<Arc<AppState>>,
 ) -> Response {
     info!("running command get_file");
-    dragoon_command!(state, GetFile, file_hash, powers_path)
+    dragoon_command!(state, GetFile, file_hash, output_filename, powers_path)
 }
 
 pub(crate) async fn create_cmd_get_listeners(State(state): State<Arc<AppState>>) -> Response {