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/dragoon_network.rs

@@ -376,6 +376,7 @@ where
                 Message::Request {
                     request, channel, ..
                 } => {
+                    debug!("Received a request for block info: {:?}", request);
                     if let Err(e) = self.info_request(request, channel).await {
                         error!("{}", e)
                     }
@@ -462,6 +463,10 @@ where
     ) -> Result<()> {
         let PeerBlockInfoRequest { file_hash } = request;
         let block_hashes = self.get_block_list(file_hash.clone()).await?;
+        debug!(
+            "A peer request the blocks for file {}, node has : {:?}",
+            file_hash, block_hashes
+        );
         let channel_info = format!("{:?}", &channel);
         let peer_block_info = PeerBlockInfo {
             peer_id_base_58: self.swarm.local_peer_id().to_base58(),