Meta-TODO: Associate in-comment TODOs with Issues

[alxmrs]

https://github.com/cubed-dev/cubed/blob/5f75ba24544fb3f16ab7b8f477334fa47da1a1b2/cubed/array_api/manipulation_functions.py#L546

A pattern for tracking work I really enjoy is associating TODOs in code with github issues. Even if these are the lowest priority, it's still nice to associate code with some issue tracker.

The above line could look like:

TODO(#XXX): check arrays all have same shape 

for example.