add more columns to macos ps -l (#15341)

# Description

This PR adds a few more columns to the macos version of `ps -l` to bring
it more inline with the Linux and Windows version.

Columns added: user_id, priority, process_threads

I also added some comments that describe the TaskInfo structure. I
couldn't find any good information to add to the BSDInfo structure.

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crates/nu-command/src/system/ps.rs

@@ -176,11 +176,14 @@ fn run_ps(
             }
             #[cfg(target_os = "macos")]
             {
-                record.push("cwd", Value::string(proc.cwd(), span));
                 let timestamp = Local
                     .timestamp_nanos(proc.start_time * 1_000_000_000)
                     .into();
                 record.push("start_time", Value::date(timestamp, span));
+                record.push("user_id", Value::int(proc.user_id, span));
+                record.push("priority", Value::int(proc.priority, span));
+                record.push("process_threads", Value::int(proc.task_thread_num, span));
+                record.push("cwd", Value::string(proc.cwd(), span));
             }
         }