Remove support for generateCursor
Remove support for generateCursor

Summary: `generateCursor` has been deprecated in favor of `latestCursor`, so we should remove this functionality from the SDKs as well.

Test Plan: Tested.

Reviewers: evan, spang, khamidou

Differential Revision: https://phab.nylas.com/D5782

nylas/nylas-nodejs,nylas/nylas-nodejs,nylas/nylas-nodejs