Add Pagination to Delete Commands

[ben-githubs]

Background

The delete command cannot handle more than 100 IDs being passed at any given time, so this PR adds some basic pagination to that command. This is necessary because we intend to start deprecating rules and ask customers to run delete against a masterlist of IDs which will grow over time.

Changes

• added a batching function
• modified PublicAPIClient.delete_saved_queries and PublicAPIClient.delete_detections to invoke the GQL endpoint in batches of 100 or less

Testing

• tested manually by invoking pat delete with 150 detection IDs and 150 query names
• added 3 unit tests for the _batched function