Function should_update_record 

pub async fn should_update_record<F>(
    zone_name: &str,
    name: &str,
    record_type: RecordType,
    record_type_name: &str,
    server: &str,
    compare_fn: F,
) -> Result<bool>
where
    F: FnOnce(&[Record]) -> bool,

Helper for declarative record reconciliation.

Implements the observe → diff → act pattern for DNS records:

1. Query existing record
2. Compare with desired state using provided callback
3. Skip if already correct, otherwise proceed with update

Arguments

• zone_name - The DNS zone name
• name - The record name
• record_type - The DNS record type
• record_type_name - Human-readable name (e.g., “A”, “AAAA”)
• server - The DNS server address
• compare_fn - Callback to compare existing records with desired state

Returns

Returns Ok(true) if update is needed, Ok(false) if record already matches.

Errors

Returns an error only if the query fails critically.