added case.set_share

[lamachin3]

add set_share to case endpoint

[Kamforka]

Could you please also add this test to the case endpoint tests:

    def test_share_and_set_share(self, thehive: TheHiveApi, test_case: OutputCase):
        organisation = "share-org"
        share: InputShare = {"organisation": organisation}

        shares = thehive.case.share(case_id=test_case["_id"], shares=[share])
        assert len(thehive.case.list_shares(case_id=test_case["_id"])) == len(shares)

        set_shares = thehive.case.set_share(case_id=test_case["_id"], shares=[])
        assert len(thehive.case.list_shares(case_id=test_case["_id"])) == len(set_shares)

Otherwise looks good!