Function validate_function 

pub fn validate_function(func: &ItemFn) -> Result<(), ValidationError>

Validate that a function conforms to the stencil kernel DSL.

Constraints

• No loops (for, while, loop) - use parallel threads
• No closures
• No async/await
• No heap allocations (Vec, Box, String, etc.)
• No recursion
• No trait objects

Returns

Ok(()) if validation passes, Err with the first validation error otherwise.