TL;DR

Added support for the concat function in the allowed functions list.

What changed?

Added the concat function to the allowedFunctions map, enabling string concatenation operations.

How to test?

1. Use the concat function in your queries or templates
2. Verify that the function executes without permission errors
3. Confirm that string concatenation works as expected

Why make this change?

String concatenation is a fundamental operation needed for data manipulation and string formatting. Adding the concat function provides users with the ability to combine strings dynamically within their queries or templates.