Add support for 'cursor'

[shreyas-ML]

My API supports pagination. In DB query the primary key 'ID' is used as cursor to get the next set of values after the nextToken ID. Its working fine in prisma but not getting next values from the prismock data. @morintd

[shreyas-ML]

@morintd Please review this issue.

[morintd]

Hello, I could definitely be interested in adding support for cursors, but will need to investigate, I'll add it to my to-do list but don't expect to have it done short-term