Ability to fetch the last page

[GP4cK]

nestjs-query/packages/query-graphql/src/types/query/paging/cursor-paging.type.ts

Lines 50 to 57 in f894eed

	// Required `before`. This is a weird corner case.
	// We'd have to invert the ordering of query to get the last few items then re-invert it when emitting the results.
	// We'll just ignore it for now.
	@Validate(CannotUseWithout, ['before'])
	@Validate(CannotUseWith, ['after', 'first'])
	@Min(1)
	@IsPositive()
	last?: number

Right now, we cannot use last without before so if we don't know the cursor of the last item, we cannot fetch the last page.