feat: add support for space-separated migration names (#1570)

* feat: add ability to create space separated migration names

* fmt

* Trim whitespace

---------

Co-authored-by: Billy Chan <ccw.billy.123@gmail.com>

sea-orm-cli/src/commands/migrate.rs

@@ -147,6 +147,8 @@ pub fn run_migrate_generate(
     } else {
         Local::now().format(FMT)
     };
+
+    let migration_name = migration_name.trim().replace(' ', "_");
     let migration_name = format!("m{formatted_now}_{migration_name}");
 
     create_new_migration(&migration_name, migration_dir)?;