node/log: Define syslog identifier — heartwood

The argument passed to fn logger would only be used as a fallback. Make it required to pass an identifier, as this is a good practice.

                     return Err(Box::new(JournalError::NotConnected));
                 }
                 logger::<&str, &str, _>("radicle-node".to_string(), []).map_err(Box::new)?
                 const SYSLOG_IDENTIFIER: &str = "radicle-node";
                 logger::<&str, &str, _>(SYSLOG_IDENTIFIER.to_string(), []).map_err(Box::new)?
             }
             Logger::Radicle => Box::new(radicle::logger::Logger::new(level)),
         }

 use systemd_journal_logger::{connected_to_journal, current_exe_identifier, JournalLog};
 use systemd_journal_logger::{connected_to_journal, JournalLog};
 /// If the current process is directly connected to the systemd journal,
 /// return a logger that will write to it.
 pub fn logger<K, V, I>(
     default_identifier: String,
     extra_fields: I,
 ) -> std::io::Result<Box<dyn log::Log>>
 pub fn logger<K, V, I>(identifier: String, extra_fields: I) -> std::io::Result<Box<dyn log::Log>>
 where
     I: IntoIterator<Item = (K, V)>,
     K: AsRef<str>,

 {
     Ok(Box::new(
         JournalLog::new()?
             .with_syslog_identifier(current_exe_identifier().unwrap_or(default_identifier))
             .with_syslog_identifier(identifier)
             .with_extra_fields(extra_fields),
     ))
 }