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

@@ -16,6 +16,7 @@ use tokio::sync::{
 use tracing::{error, info};
 
 use crate::app::AppState;
+use crate::dragoon_network::BlockResponse;
 use crate::error::DragoonError;
 use crate::peer_block_info::PeerBlockInfo;
 use crate::to_serialize::{ConvertSer, JsonWrapper};
@@ -94,7 +95,7 @@ pub(crate) enum DragoonCommand {
         peer_id: PeerId,
         file_hash: String,
         block_hash: String,
-        sender: SenderOneS<Vec<u8>>,
+        sender: SenderOneS<BlockResponse>,
     },
     GetBlocksInfoFrom {
         peer_id: PeerId,