…e interface.

Merged Async Read / Write Operations into their sync operations counterparts.

* AsyncWriteOperation into WriteOperation is a simple merge
* AsyncReadOperation into ReadOperation requires an additional type parameter
  This is due to async and sync cursors have different types.

Added extra ReadOperations interfaces to represent:
  * Read operations that return the same type for sync / async
  * Read operations that represent cursors

Removed SyncOperations and AsyncOperations builders which both use the same Operations builder class.

JAVA-4900