feat: adds the setup command to the sqlx-cli

The reset command is the equivalent of `sqlx db create`,
and `sqlx migrate run`.

sqlx-cli/src/opt.rs

@@ -64,6 +64,8 @@ pub enum DatabaseCommand {
         #[clap(short)]
         yes: bool,
     },
+    /// Creates the database specified in your DATABASE_URL and runs any pending migrations.
+    Setup,
 }
 
 /// Group of commands for creating and running migrations.