Add monero-recovery command to print address + view/spend keys

This allows manual recovery of problems like https://github.com/comit-network/xmr-btc-swap/issues/537
Since we could not figure out what causes this issue, and it is most likely an upstream problem this is the best we can do so far to allow the user to manually interact with `monero-wallet-cli` or `monero-wallet-rpc`.

swap/src/cli/command.rs

@@ -249,6 +249,15 @@ where
                 },
             }
         }
+        RawCommand::MoneroRecovery { swap_id } => Arguments {
+            env_config: env_config_from(is_testnet),
+            debug,
+            json,
+            data_dir: data::data_dir_from(data, is_testnet)?,
+            cmd: Command::MoneroRecovery {
+                swap_id: swap_id.swap_id,
+            },
+        },
     };
 
     Ok(ParseResult::Arguments(arguments))
@@ -303,6 +312,9 @@ pub enum Command {
         bitcoin_electrum_rpc_url: Url,
         bitcoin_target_block: usize,
     },
+    MoneroRecovery {
+        swap_id: Uuid,
+    },
 }
 
 #[derive(structopt::StructOpt, Debug)]
@@ -439,6 +451,13 @@ enum RawCommand {
         #[structopt(flatten)]
         bitcoin: Bitcoin,
     },
+    /// Prints Monero information related to the swap in case the generated
+    /// wallet fails to detect the funds. This can only be used for swaps
+    /// that are in a `btc is redeemed` state.
+    MoneroRecovery {
+        #[structopt(flatten)]
+        swap_id: SwapId,
+    },
 }
 
 #[derive(structopt::StructOpt, Debug)]