Add properties ErrorRetry and ErrorRetryTimeout to DirectoryEnumerationFilters class.

[Yomodo]

/// <summary>The number of retries, excluding the first attempt. Default is <c>0</c>.</summary>
public int ErrorRetry { get; set; }

/// <summary>The wait time in seconds between retries. Default is <c>10</c> seconds.</summary>
public int ErrorRetryTimeout { get; set; }