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

tests/message_exchange_block_per_block.nu

@@ -4,8 +4,6 @@ use std assert
 
 # define variables
 let SWARM = swarm create 2
-let record_name = "tata"
-let message = "it works at least"
 let sleep_duration = 5sec
 mut node_is_setup = false
 let output_dir: path = "/tmp/dragoon_test/received_blocks"
@@ -74,8 +72,8 @@ try {
     print "\nNode 0 starts providing the file"
     app start-provide --node $SWARM.0.ip_port $file_hash
 
-    print "\nSleeping for 2sec to ensure the start provide finished"
-    sleep 2sec
+    print $"\nSleeping for ($sleep_duration) to ensure the start provide finished"
+    sleep $sleep_duration
     print "Resuming execution\n"
 
     print "Node 1 starts searching for the providers with the file hash"