🪲 Variables should have visibility options

[joocer]

Thank you for taking the time to report a problem with Opteryx.

To help us to respond to your request we ask that you try to provide the below detail about the bug.

Describe the bug A clear and specific description of what the bug is. What the error, incorrect or unexpected behaviour was.
User has reported they do not want all of the variables to be visible to all users (e.g. @@Version)

Expected behaviour A clear and concise description of what you expected to happen.

Sample Code/Statement If you can, please submit the SQL statement or Python code snippet, or a representative example using the sample datasets.

Additional context Add any other context about the problem here, for example what you have done to try to diagnose or workaround the problem.