Propose method and client-level specification of desired units for input/output

[bdpedigo]

we discussed two interfaces for specifying the units for dimensions for inputs and outputs:

1. methods could implement a units/resolution/etc. flag which denotes what units a user is inputting (e.g. for a bounding box) or expecting (e.g. for a spatial location return value). the default would be None which would not change the current behavior
2. the CAVEClient class could also implement the same flag, and would also be None by default. specifying this would lead to all subsequent calls being in those units, unless overridden at the method level

[bdpedigo]

Functions/methods with some kind of spatial input/return:

• most things in annotation, e.g.
  • annotation.create_table: voxel_resolution
    • already has a flag for this kind of thing
  • annotation.post_annotation_df: position_columns ?
  • annotation.update_annotation_df
• chunkedgraph
  • do_merge
  • execute_split
  • find_path
  • get_contact_sites
  • get_operation_details
  • get_subgraph
  • preview_split
• l2cache
  • get_data
    • at least for the nm properties... not sure what to do here
• materialization
  • basically anything with query in the name