Function get_provided_packages 

pub fn get_provided_packages<S: BuildHasher + Default>(
    _installed: &HashSet<String, S>,
) -> HashSet<String>

What: Build an empty provides set (for API compatibility).

Inputs:

• installed: Set of installed package names (unused, kept for API compatibility).

Output:

• Returns an empty set (provides are now checked lazily).

Details:

• This function is kept for API compatibility but no longer builds the full provides set.
• Provides are now checked on-demand using check_if_provided() for better performance.