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

@@ -93,16 +93,13 @@ pub(crate) async fn create_swarm(
             )),
             request_block: request_response::cbor::Behaviour::new(
                 [(
-                    StreamProtocol::new("/file-exchange/1"),
+                    StreamProtocol::new("/block-exchange/1"),
                     ProtocolSupport::Full,
                 )],
                 request_response::Config::default(),
             ),
             request_info: request_response::cbor::Behaviour::new(
-                [(
-                    StreamProtocol::new("/file-exchange/1"),
-                    ProtocolSupport::Full,
-                )],
+                [(StreamProtocol::new("/peer-info/1"), ProtocolSupport::Full)],
                 request_response::Config::default(),
             ),
         })?