Requesting "Dry Run" feature

If I'd like to execute a command that will have some effect - an UPDATE, INSERT, or DELETE for instance - it would be nice to know how many objects that command is going to affect without actually having any effect. In many CLI tools, this is called a "dry run".
It would be great to see a dry run feature in `mssql-cli`.

Comienza siguiendo cómo mssql-cli ejecuta los comandos UPDATE, INSERT y DELETE. Define cómo un dry run informaría del número de objetos afectados sin modificar la base de datos y, después, verifica el comportamiento de cada tipo de comando.

Escrito por el modelo de indexación a partir del texto del issue.