[feature] lazy sync the mysqluser.

[runkecheng]

Is your feature request related to a problem? Please describe.

At present, the Controller is regularly synchronize the mysqluser. Most of the time this operation is meaningless.

 2022-08-17T15:36:32.844776+08:00 5351 [Warning] Following users were specified in CREATE USER IF NOT EXISTS but they already exist. Corresponding entry in binary log used default authentication plugin 'mysql_native_password' to rewrite authentication information(if any) for them: 'super_user'@'%'

Describe the solution you'd like

Operator should not care of whether the User has been deleted through other ways. This can reduce the SQL operation of Operator.

Describe alternatives you've considered

add a option which can adjust policy of force sync.

Additional context