ec2.images and ec2.snapshots don't return all results

[nineinchnick]

ec2.images are limited to self-owned images only, because otherwise, the query would never finish. ec2.snapshots has a default limit of 100 results set for the same reason.

To address this, it is required to:

• add predicate pushdown to allow fetching a limited number of results
• add limit and topN pushdown
• return an Iterator instead of a List of rows, since it's lazy, to allow to cancel queries; same as in https://github.com/nineinchnick/trino-rest/blob/master/trino-rest-github/src/main/java/pl/net/was/rest/github/GithubRest.java#L1905

[nineinchnick]

Predicate pushdown support has been added in 47e8d0e

[nineinchnick]

I fixed that for images, by either requiring predicates or a limit clause