Given a list of Contact records, attempt to delete them using Database.delete with the allOrNone parameter set to false. This allows partial success - some records may delete successfully while others may fail. Return a Map with two keys: success containing the count of successfully deleted records, and failed containing the count of failed deletions. Handle null or empty input lists by returning zeros for both counts.

Examples:

Input: contacts = [Contact1, Contact2, Contact3] (all deletable) Output: {'success': 3, 'failed': 0} Explanation: All 3 contacts were successfully deleted Input: contacts = null Output: {'success': 0, 'failed': 0} Explanation: Null input returns zero counts for both success and failed Input: contacts = [] Output: {'success': 0, 'failed': 0} Explanation: Empty list returns zero counts for both success and failed
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