Command line interface for accessing the Open Web Index shards and slices.

refactor(core): Cycle 2 - manager package restructure master

- Create core/manager/ package with env, config, session, manager, ui, logging - Add Pydantic configuration models (OWILIXSettings, RepositoryConfig) - Add OWILIXSession wrapper for unified session/iRODS access - Move irodsfsspec.py to fsspec/ package - Delete old shim files, update all imports - Add pydantic-settings dependency, irods-tcp optional group - Fix python-irodsclient v3.x compatibility - Add 19 unit tests for manager package