starting to work with minio for runs

[SubhadityaMukherjee]

Objective here is to allow downloading run information from minio. Not replacing any functionality for now.

[SubhadityaMukherjee]

Context -> I made a field called minio_url similar to that in datasets. Not entirely sure if pointing to the bucket url is enough here. eg: passing (for id: 142379 'minio_url ... runs/0000/0000/0014/2379' ) this to the python api openml._api_calls._download_minio_bucket might not work fully without giving it the xml file name. Reference implementation.

Seems I cant test the entire thing on a mac, so I will test it on a linux machine later on.