Add array api function to simplify adding arrays to modo

[almutlue]

The current way of adding an array to a modo includes 2 steps:

1. add the element specifying the array metadata to modo
2. add the array to modos zarr group

For the user these steps can be confusing and we allow inconsistencies, e.g. specifying any array path in the element, unrelated where the array is added in the hierarchy. Also the zarr framework can feel cumbersome, if not used to.

• Add modo api function modo.add_array() to wrap both steps
• Update docs in docs/tutorials/modo_array()

Open question:

1. What about modo.add_element()? Do we allow adding array metadata (step 1above)?
2. Should modo_add_array() also take care of rowname/colname handling?

[almutlue]

Proposal:

• Input should be csv file or numpy array.
• on api: add to add_element specific function for add_array, add_file
• on cli: keep modo add (infer from datat type)