[test]: added a test for retrieving annotation objects based on voxelid
[test]: added a test for retrieving annotation objects based on voxelid

neurodata/ndstore,openconnectome/open-connectome,openconnectome/open-connectome,openconnectome/open-connectome,openconnectome/open-connectome,neurodata/ndstore,openconnectome/open-connectome,openconnectome/open-connectome,neurodata/ndstore,neurodata/ndstore