Add `SHOW DEPLOYMENT` and `DROP DEPLOYMENT` command

[dl239]

> SHOW DEPLOYMENT demo_data_service;
> SHOW DEPLOYMENTS;
> DROP DEPLOYMENT demo_data_service;

drop index and procedure in DROP DEPLOYMENT

[aceforeverd]

> SHOW DEPLOYMENT demo_data_service;

what's the meaning of show deployment xxx?
If that means the deployment status, is it necessary to add show create deployment xxx, which means deployment schema

> SHOW DEPLOYMENTS;
> DROP DEPLOYMENT demo_data_service;

drop index and procedure in DROP DEPLOYMENT