inference part of project installs in plain packages list

[AnikinNN]

When swebench is installed using pip, the inference part of repo is accessible through inference name:

from inference.make_datasets.bm25_retrieval import main

if __name__ == '__main__':
    main()

Which can become a conflict name when some project uses same internal package name.

My proposal is to move inference package inside of swebench package:

from swebench.inference.make_datasets.bm25_retrieval import main

if __name__ == '__main__':
    main()