Replicas: Add type hints

[rdimaio]

Part of #6454
Tests pass locally

[dchristidis]

It’s useful to prefix the commit message with a component. I would guess that Replicas: is the best match here? Otherwise the changes contained in the commit are perfect.

[rdimaio]

Test failure seems unrelated:

 tests/test_judge_evaluator.py:520: in test_judge_double_container_with_existing_rule
    assert not get_replica_locks(**F)
E   AssertionError: assert not [<rucio.db.sqla.models.ReplicaLock object at 0x7f7caf7dc460>]
E    +  where [<rucio.db.sqla.models.ReplicaLock object at 0x7f7caf7dc460>] = get_replica_locks(**{'name': '/belle/HCXHHT-judge_evaluator-judge_double_container_with_existing_rule-/cont_e77000060ac143ce88854e57b3cc4844/dataset_4d975954d5d4492c9821573cb9fe46bd/file_a92a8acd339444c3a7bc2a91730587ec', 'scope': mock})

re-running