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

app.nu

@@ -204,3 +204,20 @@ export def get-file [
     $"get-file/($file_hash)/($output_filename)/($powers_path | slash replace)" | run-command $node
 
 }
+
+export def get-blocks-info-from [
+    peer_id_base_58: string,
+    filename: string,
+    --node: string = $DEFAULT_IP,
+] nothing -> any {
+    log debug $"Getting the list of blocks from ($peer_id_base_58) for file ($filename)"
+    $"get-blocks-info-from/($peer_id_base_58)/($filename)" | run-command $node
+}
+
+export def get-block-list [
+    filename: string,
+    --node: string = $DEFAULT_IP,
+] nothing -> any {
+    log debug $"Getting the list of blocks for file ($filename) from own node"
+    $"get-block-list/($filename)" | run-command $node
+}