The AssetQuery interface supports specifying the max results but doesn't support the offset, which makes it unusable for paging.

Add AssetQuery#getOffset() and AssetQuery.Builder#withOffset(long offset) methods.

Rationale: it is planned to create jcr-agnostic AssetContainer that serves as bridge between AssetProviders and UI.
Right now, DAM app uses AbstractJcrContainer which uses JCR queries directly.