Enhancement: Support 'ExpandoObject' in 'BulkMerge'

[mikependon]

Code below must be supported.

using (var connection = new SqlConnection(connectionString))
{
	var list = new List<IDictionary<string, object>>();

	for (var i = 0; i < 100; i++)
	{
		/* First Record */
		var entity = new ExpandoObject() as IDictionary<string, object>();
		customer.Add("Id", (i + 1));
		customer.Add("LastUpdatedUtc", DateTime.UtcNow);
		/* Add more columns */
		list.Add(entity);
	}

	// Calls
	connection.BulkMerge("Customer", list);
}