fix: paginator generator nullability bug caused by documents

[0marperez]

Issue \

The paginator generator is not code-generating nullable literals for item paginators of lists that have values that are nullable. It will only code-generate nullability if the list is marked as sparse and not check if the list has values that are nullable.

Lists are not supposed to contain nullable items unless marked as sparse, so this is non-modeled behavior that we were not looking for but is necessary because documents are always nullable in smithy kotlin.

Description of changes

The paginator generator now checks if the collection is made of nullable symbols and code generates nullability

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[0marperez]

Yeah, this was my mistake I marked as ready for review before adding the tests!

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