SubqueryAggregate does not expose parameters other than distinct

[airstrike]

See

django-sql-utils/sql_util/aggregates.py

Lines 161 to 168 in 88cf3a6

	# Add test for output_field, distinct, and when resolved_expression.field.name isn't what we're aggregating
	if not self.output_field:
	self._output_field = self.output_field = target_expression.field
	if self.distinct is not None:
	aggregation = self.aggregate(target_expression, distinct=self.distinct)
	else:
	aggregation = self.aggregate(target_expression)

This makes the ordering argument in ArrayAgg impossible to use. Ditto for any custom Aggregation a user may want to write

[airstrike]

Somewhat related to django/django#28296

[martsberger]

Ordering was added, but it is true that if there are other parameters to the aggregation, there is no mechanism to pass them. I will look into making this more general.

[jsayles]

The new default attribute on Sum would be lovely.