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

@@ -605,9 +605,7 @@ where
                 tokio::spawn(async move {
                     // instead of returning the stream directly through the Sender, put it in a Vec format so it's easier to read for the person getting it
                     let mut all_providers = Vec::<PeerId>::default();
-                    debug!("hello there");
                     while let Some(provider) = provider_stream.next().await {
-                        debug!("got there");
                         all_providers.push(provider);
                     }
                     if sender.send(Ok(all_providers)).is_err() {
@@ -986,8 +984,6 @@ where
             }
         };
 
-        debug!("got here");
-
         providers.boxed()
     }